Chapter 27

Christ's Sinlessness, Temptation, and the Pelagian Problem for Physicalism

Introduction: Why Sinlessness Matters for the Incarnation Debate

One of the most beautiful and precious truths in all of Christian theology is this: Jesus Christ, the Son of God made flesh, lived an entirely sinless life. He was genuinely tempted — not in some pretend, staged way, but with real, painful, agonizing temptation — and yet He never sinned. Not once. Not even close. His sinlessness is not a minor detail in the story of our salvation. It stands at the very heart of the gospel. If Jesus had sinned even once, He could not have been our perfect sacrifice. He could not have borne our sins on the cross. He could not have reconciled us to God. The entire plan of redemption depends on Christ's sinless perfection.

But here is a question that does not get nearly enough attention: How do we explain Christ's sinlessness? What accounts for the fact that Jesus — a genuine human being who experienced real temptation — never gave in to sin? This is not just a curiosity. The answer we give depends heavily on what we believe about human nature. And it is here, I believe, that physicalism about human nature runs into one of its most devastating problems.

This chapter argues that physicalism creates a serious dilemma — a genuine trap with no good escape — when it tries to account for Christ's sinlessness. The dilemma works like this. If physicalism is true, then everything about a human being — including moral choices, temptations, desires, and dispositions — is ultimately a function of the physical brain. There is no immaterial soul where moral agency resides. The brain is all there is. Now, if Christ had a normal human brain (which His genuine humanity requires), what prevented Him from sinning? Every other human being with a normal brain sins. Why didn't Jesus? The physicalist has only two options, and both are catastrophic.

The first option: Christ's brain was physically different from ours — perhaps it was specially wired to prevent sin. But if that is the case, then Christ did not truly share our human nature. He had a different kind of brain, and therefore a different kind of humanity. And if He did not fully share our nature, then He cannot save us. Gregory of Nazianzus's famous axiom applies with full force: "What is not assumed is not healed."¹

The second option: Christ's brain was the same as ours, and He simply chose not to sin through His own natural human willpower. But this is Pelagianism — the ancient heresy that teaches human beings can achieve moral perfection through their own natural abilities without any special supernatural grace. If Christ could avoid sin with a normal, unassisted human brain, then why can't we? Physicalism, on this horn of the dilemma, implies that sin is entirely avoidable through natural effort, which the church condemned long ago.

On substance dualism, by contrast, Christ's sinlessness has a clear and coherent explanation. His human soul was directly created by God, without the corruption of original sin. And the Holy Spirit empowered and sustained that human soul throughout His earthly life, enabling His human will to choose obedience at every point. This is not Pelagianism, because Christ's sinlessness depends on the unique divine act of creating His soul and on the ongoing supernatural empowerment of the Spirit — not on mere human willpower.

I want to walk through this argument carefully in this chapter. We will look first at the biblical evidence for Christ's sinlessness and the reality of His temptation. Then we will examine the physicalist dilemma in detail — both horns — and show why neither option works. We will then consider the problem of original sin on physicalism, which makes the dilemma even worse. After that, we will see how substance dualism provides a clear and satisfying account of Christ's sinlessness. Along the way, we will engage extensively with the arguments of Matthew Hart and R. Scott Smith in Christian Physicalism?, who have demonstrated powerfully that physicalism entails Pelagianism and undermines sanctification. Finally, we will respond to several possible physicalist objections.

The Biblical Evidence for Christ's Sinlessness

The New Testament is remarkably clear and emphatic that Jesus Christ was without sin. This is not an inference drawn from silence — as if the Gospels simply forgot to mention a sin He committed. It is a positive, repeated, explicit affirmation made by multiple authors across different contexts. Let us look at the key texts.

Hebrews 4:15 — Tempted in Every Way, Yet Without Sin

"For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin." (Hebrews 4:15, ESV)

This is perhaps the single most important verse in the entire New Testament for our topic. It teaches us two things at the same time. First, Jesus was genuinely tempted — not in some partial or limited way, but "in every respect" (kata panta, κατὰ πάντα) "as we are" (kath' homoiotēta, καθ' ὁμοιότητα, according to our likeness). The temptation was real. It was comprehensive. It touched every dimension of human experience. Jesus knew what it felt like to be drawn toward something wrong — to feel the pull of desire, the pressure of the moment, the weight of exhaustion and fear. If His temptation was not real, He could not "sympathize with our weaknesses." But the text insists that He can — precisely because He has been where we are.²

Second, despite this comprehensive temptation, Jesus remained chōris hamartias (χωρὶς ἁμαρτίας) — "without sin." The Greek phrase is strong and unambiguous. It means "apart from sin" or "separated from sin." The preposition chōris denotes complete absence or separation. There is no qualification, no hedging, no exception. Jesus was tempted in every respect as we are — yet without sin. Period.

Now, notice what this requires. Genuine temptation demands a genuine interior life. You cannot be tempted unless you have a will that can be drawn, desires that can be stirred, and an inner life where the struggle actually takes place. A rock cannot be tempted. A computer cannot be tempted. Temptation is an experience of the soul — the human will confronting a real pull toward sin and choosing obedience instead. As we argued in Chapter 8, the language of temptation throughout the Gospels presupposes a rich inner life — a soul that feels, desires, struggles, and chooses.³

On physicalism, temptation is nothing more than a brain state — a particular pattern of neural firing that produces certain impulses. And sinlessness is just another brain state — the absence of certain neural events. But is that really what the author of Hebrews means? Is he telling us that Jesus had a pattern of neural firings that never included the particular configuration associated with sinful behavior? That seems profoundly inadequate as an account of what was happening in Gethsemane, or in the wilderness temptation, or on the cross.

2 Corinthians 5:21 — He Who Knew No Sin

"For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God." (2 Corinthians 5:21, ESV)

Paul here affirms two staggering truths. First, Christ "knew no sin" — the Greek is ton mē gnonta hamartian (τὸν μὴ γνόντα ἁμαρτίαν). The word gnonta is an aorist participle of ginōskō (γινώσκω), meaning "to know" in an experiential, intimate sense. Christ never had an experiential acquaintance with sin. He never participated in it. He never engaged in it. His knowledge of sin was only external — He saw it in others, He grieved over it, He bore its consequences — but He never knew it from the inside as a personal experience of moral failure.⁴

Second — and this is the heart of the gospel — God "made him to be sin" on our behalf. Christ bore our sin on the cross as our substitute. But this substitutionary work only has efficacy if the One who bears our sin is Himself sinless. A sinful sacrifice cannot atone for sin. Only a spotless lamb can take away the sin of the world (John 1:29). Christ's sinlessness is therefore not incidental to the atonement; it is foundational to it.

1 Peter 2:22 — He Committed No Sin

"He committed no sin, neither was deceit found in his mouth." (1 Peter 2:22, ESV)

Peter is quoting Isaiah 53:9, applying the language of the Suffering Servant directly to Jesus. The Greek hamartian ouk epoiēsen (ἁμαρτίαν οὐκ ἐποίησεν) — "he did not do sin" — is comprehensive. It covers not only external acts of sin but the internal posture as well: "neither was deceit found in his mouth." This is moral purity that reaches to the very depths of the person. It is not merely behavioral compliance — the avoidance of sinful actions — but an inner integrity that extends to thought, intention, and speech.⁵

1 John 3:5 — In Him There Is No Sin

"You know that he appeared in order to take away sins, and in him there is no sin." (1 John 3:5, ESV)

John's statement is the most ontological of the four. He does not merely say that Jesus never sinned (a claim about His actions) but that "in him there is no sin" — hamartia en autō ouk estin (ἁμαρτία ἐν αὐτῷ οὐκ ἔστιν). This is a statement about Christ's very being. Sin is not merely absent from His behavior; it is absent from His person. There is no sin in Him — not in His will, not in His desires, not in His nature. The present tense estin (ἔστιν, "is") points to an enduring state, not merely a past track record.⁶

The Physicalist Dilemma: Two Horns, No Escape

Now we come to the heart of the chapter. If physicalism is true — if human beings are entirely physical organisms with no immaterial soul — then how do we explain Christ's sinlessness? We are about to see that physicalism presents us with a dilemma that has no satisfying resolution. Both horns of the dilemma are fatal, and every attempted escape route leads to further problems.

Before we lay out the dilemma, we need to be very clear about what physicalism commits us to regarding sin and moral agency. On physicalism, every human mental event — every thought, desire, intention, choice, and moral disposition — is either identical to, constituted by, or supervenes upon physical brain states. There is no immaterial soul that thinks, wills, or desires. The brain does all of this work. As Matthew Hart explains in his important essay "Christian Materialism Entails Pelagianism," if Christian materialism is true, then human mental properties supervene on human physical properties with at least the force of natural (nomological) necessity.⁷ What this means is that for any human mental property — including the mental property of "being in a state of faith," or "being disposed toward righteousness," or "being tempted to sin" — there exists some physical brain state that necessitates it. If you have the right physical configuration in your brain, you will necessarily have the corresponding mental state.

This applies to sin as well. If physicalism is true, then sinful desires, sinful choices, and sinful actions are all functions of brain states. When a person sins, it is because their brain produced the neural configuration that constitutes (or necessitates) the sinful mental state. When a person resists temptation, it is because their brain produced a different neural configuration — one that constitutes resistance rather than capitulation. There is no soul standing above the brain, making a free choice that transcends the physical. The brain is the whole story.

With this in mind, let us state the dilemma.

Horn 1: Christ's Brain Was Different from Ours

Suppose the physicalist says that Christ never sinned because His brain was physically different from ours. Perhaps God designed Christ's brain with a special neural architecture that made sinful impulses impossible — a brain that simply could not generate the configurations associated with sin. Or perhaps Christ's brain had enhanced connectivity in the regions associated with self-control, or diminished activity in the regions associated with selfish desire. On this view, Christ avoided sin because His physical hardware was different from normal human hardware.

This might seem initially plausible. After all, the Incarnation is a miraculous event, and God certainly has the power to design a special brain. But there is a devastating theological problem with this option. If Christ's brain was physically different from ours, then He did not truly share our human nature.

Think about what this means. Every other human being who has ever lived has a brain that produces sinful impulses. On physicalism, this is just what normal human brains do. The neural configurations associated with selfish desire, pride, lust, anger, and covetousness are part of the standard operating equipment of the human brain. If Christ's brain was designed to avoid these configurations, then His brain was not a normal human brain. It was a special, enhanced, different-from-ours brain. And if His brain was different, then His human nature was different. He did not truly become one of us. He became something else — something that looked human on the outside but was neurologically alien on the inside.⁸

And here is where Gregory of Nazianzus's axiom — the most important principle in all of Christology — comes crashing down on this option with devastating force. Gregory wrote in his famous Epistle 101: "That which is not assumed is not healed" (to gar aproslepton, atherapeuton, τὸ γὰρ ἀπρόσληπτον, ἀθεράπευτον).⁹ If Christ did not assume a genuine, normal, fully human nature — including a brain that works the way our brains work — then He did not heal that nature. The whole point of the Incarnation is that the Son of God took on our nature, entered into our condition, and redeemed us from the inside. If His brain was a special model that was immune to the temptations that afflict us, then He did not truly enter our condition. He did not truly assume what needs to be healed. As we discussed fully in Chapter 12, this was precisely the reason the church condemned Apollinarianism — because an incomplete human nature cannot save us.¹⁰

The Chalcedonian Definition insists that Christ is homoousios hēmin kata tēn anthrōpotēta (ὁμοούσιος ἡμῖν κατὰ τὴν ἀνθρωπότητα) — "consubstantial with us according to the humanity."¹¹ He shares our substance. His human nature is the same kind as ours. If His brain was a special anti-sin model, then He was not consubstantial with us in the very organ that physicalism says constitutes the whole person. He had a different kind of brain, which on physicalism means He had a different kind of humanity.

Furthermore, Hebrews 4:15 explicitly tells us that Christ was tempted "in every respect as we are." If His brain was physically incapable of generating sinful impulses, then He was not tempted as we are. He was tempted in a fundamentally different way — or perhaps not truly tempted at all. A brain that cannot produce sinful impulses cannot experience genuine temptation. It is like saying a person is tempted by chocolate but has no taste buds and no desire for sweetness. The "temptation" would be a sham.

So Horn 1 fails. If Christ's brain was different from ours, He did not truly share our nature, His temptation was not genuine, and Gregory's axiom rules out His saving work. This is precisely the kind of docetic or quasi-Apollinarian Christology that the early church rejected.

Horn 2: Christ's Brain Was the Same as Ours — Pelagianism

Suppose, then, that the physicalist takes the other horn. Christ's brain was a perfectly normal human brain — the same as yours and mine. He had the same neural architecture, the same physical hardware, the same susceptibility to the brain states associated with temptation. But He simply chose, through His own natural human capacities, not to sin. His brain produced the same tempting impulses that our brains produce, but He — through His natural willpower, His moral discipline, His strength of character — consistently chose to resist them.

This is Pelagianism.

Let me explain why. Pelagianism was the heresy taught by the British monk Pelagius in the early fifth century. The core claim of Pelagianism, as the great Reformed theologian B. B. Warfield described it, is "the assumption of the plenary ability of man; his ability to do all that righteousness can demand — to work out not only his own salvation, but also his own perfection."¹² Pelagius taught that human beings have the natural capacity to live sinless lives without any special, supernatural grace from God. Adam's sin did not corrupt our nature — it merely set a bad example. We are born with the same moral capacity Adam had before the fall, and we can, if we choose, live without sin.

The church condemned this teaching decisively. The Council of Carthage in 418 AD rejected the Pelagian claim that human beings can achieve righteousness through their own natural powers. The Council of Ephesus in 431 AD ratified this condemnation. And the Second Council of Orange in 529 AD condemned Semi-Pelagianism — the more moderate view that human beings can at least take the first step toward God through their own initiative, even if they need grace to complete the journey.¹³

Now, here is the problem for the physicalist. If Christ had a normal human brain — the same brain that every other human being has — and He avoided sin through the natural capacities of that brain, then sinlessness is achievable through natural human effort. If a normal human brain can produce a lifetime of perfect obedience, then there is nothing about our physical nature that makes sin inevitable. Sin is not a consequence of our brain's physical architecture; it is merely a choice that we keep making but don't have to make. And if that is the case, then Pelagius was right. We don't need supernatural grace to avoid sin. We just need to try harder — to make better choices with the same equipment that Jesus used so successfully.

Hart makes this argument with careful precision. He notes that on Christian materialism, human mental properties supervene on physical properties with at least nomological necessity. This means that for any mental state — including the mental state of "having faith" or "choosing righteousness" — there exists a brain state that necessitates it. But if that is the case, then it is in principle possible for that brain state to come about through purely natural means — through chance (an accidental rearrangement of neural configurations) or through design (deliberate manipulation of the brain by a neuroscientist). If faith or righteousness can be produced by manipulating the brain, then they are not the exclusive work of divine grace. Natural means can accomplish what the church has always taught requires supernatural aid.¹⁴

Hart illustrates this with a striking thought experiment. Imagine a neuroscientist who discovers the neural configurations associated with religious faith. He develops a procedure — or perhaps even a pill — that can produce these configurations in anyone's brain. Swallow the pill, and you will have the brain state that constitutes faith. If materialism is true, this is in principle possible. But then faith is no longer the exclusive gift of the Holy Spirit. It is a neurological product that can be manufactured. This, Hart argues, clearly violates the church's condemnation of both Pelagianism and Semi-Pelagianism, since it implies that a "good mental state relating to salvation" can be obtained without divine aid.¹⁵

Apply this reasoning directly to Christ's sinlessness. On physicalism, Christ's moral perfection was constituted by certain brain states — the neural configurations associated with righteous choice. If Christ had a normal human brain, then these configurations were produced by that brain's natural functioning. No immaterial soul was involved. No supernatural empowerment of an inner, spiritual dimension of His person was at work. His brain just happened to produce the right configurations every time. But if a normal human brain is naturally capable of producing perfect moral behavior, then perfect moral behavior is a natural human capacity — and Pelagianism follows directly.

Some physicalists might try to escape this horn by appealing to God's special action on Christ's brain. Perhaps God supernaturally intervened in Christ's brain — tweaking the neural configurations, preventing the sinful impulses from forming, guiding the neurological processes from the outside. But notice what this does. It means Christ's brain was not functioning naturally. It was being supernaturally manipulated. And if Christ's moral perfection was the result of God's constant supernatural intervention in His brain states, then His moral perfection was not His own — it was God's. Christ's human will did not freely choose obedience; God overrode His brain's natural tendencies. This is a form of divine determinism that undermines the genuine moral agency of Christ's human nature. It also raises a disturbing question: if God can supernaturally manipulate brain states to prevent sin, why doesn't He do this for everyone? The problem of evil suddenly becomes much worse.¹⁶

Pelagianism and the Broader Problem for Physicalism

The Pelagian problem is not limited to Christ's sinlessness. It extends to the entire Christian doctrine of grace and salvation. Let me explain why.

Hart's argument in "Christian Materialism Entails Pelagianism" is not merely about Christ. It is about the fundamental relationship between the physical and the spiritual in human beings. The core of his argument runs as follows. The church has consistently taught that human beings cannot, by their own natural powers, achieve faith, righteousness, or salvation. This is what it means to reject Pelagianism and Semi-Pelagianism. Canon 6 of the Council of Orange states: "If anyone says that God has mercy upon us when, apart from his grace, we believe, will, desire, strive, labor, pray, watch, study, seek, ask, or knock, but does not confess that it is by the infusion and inspiration of the Holy Spirit within us that we have the faith, the will, or the strength to do all these things ... let him be anathema."¹⁷

Notice the key word: "within us." The Holy Spirit works within us to produce faith, will, and strength. This language is naturally dualist. The Spirit works on an inner, spiritual dimension of the human person — what the Bible calls the heart, the spirit, the soul. On physicalism, "within us" can only mean "within our brain." The Spirit's work is reduced to a modification of neural configurations. But if neural configurations are physical events governed by physical laws, then in principle they can be produced by physical means — which is exactly Hart's argument. The dualist avoids this problem because the soul is not a physical entity subject to physical manipulation. The Spirit's work on the soul is a genuinely supernatural act that cannot be replicated by natural means.¹⁸

Hart also observes a deeply troubling implication for evangelism. If materialism is true and faith is constituted by brain states, then in principle a neuroscientist could mass-produce faith by administering a "Faith Pill" — a chemical that produces the relevant neural configuration. Missionary work would become unnecessary; pharmacology would replace preaching. Hart writes that if such a pill were available, it might even be administered without consent — slipped into people's food or water — on the grounds that their eternal destiny is at stake. This reductio ad absurdum shows how deeply physicalism distorts the Christian understanding of faith, grace, and the work of the Holy Spirit.¹⁹

Furthermore, Hart presses the argument from the other direction. If a neuroscientist can install faith, then presumably a neuroscientist can also remove faith. A militant atheist could sneak into the home of an elderly Christian and perform an operation — or administer a drug — that destroys the neural configurations associated with faith, replacing them with rejection of God. If this is possible on materialism, then the security of the believer is fundamentally threatened. Faith is no longer something that God preserves by His Spirit; it is a fragile neural state that can be undone by a sufficiently skilled neurosurgeon.²⁰

The implications for Christ's sinlessness are clear. If sin and righteousness are brain states, then Christ's moral perfection was a neurological accident — a happy arrangement of neurons that could have been different. And if it could have been different, then either God arranged it (which means Christ's human will was not genuinely free) or it just happened naturally (which means Pelagianism is true). Neither option is acceptable.

The Problem of Original Sin on Physicalism

The Pelagian dilemma becomes even more pressing when we consider the doctrine of original sin. The traditional Christian teaching is that Adam's sin has affected all of his descendants. We are not born morally neutral. We are born with a corrupted nature — a disposition toward sin that makes actual sin inevitable (apart from divine grace). This doctrine, in various forms, has been affirmed by Catholics, Orthodox, and Protestants alike. The details differ — whether original sin involves inherited guilt or merely inherited corruption, whether it is transmitted through biological propagation or through federal headship — but the core claim is the same: something has gone wrong with human nature since the fall, and we all share in that corruption.²¹

Now, on physicalism, how is original sin transmitted? If there is no soul, then original sin cannot be a property of the soul. It must be transmitted through physical means. But what physical means? There are really only a few options, and none of them works well.

Option 1: Original Sin Is Genetic

Perhaps original sin is encoded in our DNA — a kind of genetic corruption that predisposes us to sinful behavior. Some might point to evolutionary psychology, which suggests that certain selfish, aggressive, and deceptive impulses are hardwired into our genetic inheritance as a result of natural selection. On this view, original sin is essentially our evolutionary baggage — the genetic programming that inclines us toward self-serving behavior.

But this creates a massive problem for Christ's sinlessness. Christ received His genetic material from Mary. He had a genuine human body with genuine human DNA. If original sin is genetic, then Christ inherited it from Mary along with the rest of His genetic inheritance. He would have been born with the same genetic predisposition to sin that every other human being has. But Christ was sinless. So either He miraculously overrode His genetic programming (which, on physicalism, means His brain somehow functioned differently from what His genes would predict — bringing us back to Horn 1) or His genetic material was miraculously purified (which means He did not truly share Mary's — and our — genetic inheritance, again violating genuine humanity).²²

Option 2: Original Sin Is a Brain Structure

Perhaps original sin is not in the genes but in the brain itself — a structural feature of the human brain that predisposes us to sinful impulses. Perhaps the limbic system (which processes emotion and desire) is overactive relative to the prefrontal cortex (which handles impulse control and moral reasoning), creating a built-in tendency toward selfish and impulsive behavior.

But the same problem recurs. If original sin is a brain structure, and Christ had a normal human brain, then Christ had original sin — which contradicts His sinlessness. And if Christ's brain was structured differently to avoid this problem, then He did not have a normal human brain — which contradicts His genuine humanity.

Option 3: Original Sin Is Social Conditioning

Perhaps original sin is not biological at all but social — the cumulative effect of growing up in a fallen world, surrounded by sinful people, absorbing sinful patterns of behavior through culture, example, and socialization. On this view, we are born morally neutral but are quickly corrupted by our environment.

But this is essentially Pelagianism. Pelagius himself taught that Adam's sin affected his posterity not through any transmission of a corrupt nature but merely through bad example. If original sin is merely social conditioning, then there is nothing wrong with human nature itself — only with human society. And if there is nothing wrong with our nature, then in principle we could overcome our sinful conditioning through effort, education, and better social environments. This is exactly what the church condemned.²³

Moreover, if original sin is social, it would not apply to Christ anyway, since He presumably could have been raised in a sinless environment. But then Christ's sinlessness tells us nothing about His nature — only about His upbringing. And the problem of why everyone else sins remains unsolved.

The Dualist Solution to Original Sin and Christ

On substance dualism, original sin can be understood as primarily affecting the soul — or, more precisely, the soul's relationship to the fallen body. The details of how this works are debated among dualists. Farris, in his Introduction to Theological Anthropology, helpfully surveys several models: traducian accounts (where the soul is generated from the parents' souls and inherits corruption along with its origin), creationist accounts (where God creates each soul fresh but allows it to be affected by its union with a fallen body), and various intermediate positions like emergent creationism.²⁴

The key point for our argument is this: on any of these dualist models, Christ's sinlessness has a clear explanation. Christ's human soul was directly created by God — not generated through natural human reproduction. His soul was created sinless, without the corruption that marks every other human soul. This does not mean Christ did not have a genuine human soul. It means His soul was like Adam's soul before the fall — posse non peccare (able not to sin), as the classical tradition put it.²⁵ His soul was genuinely human but uncorrupted. This is perfectly consistent with the Chalcedonian Definition, because "fallen" is not an essential property of the kind "humanity." As Oliver Crisp observes, Adam existed before the fall, and Adam was fully human. Therefore, fallenness cannot be essential to what it means to be human. Christ could have an unfallen human nature and still be genuinely, fully human — just as Adam was.²⁶

Furthermore, on dualism, Christ's body — including His brain — could be genuinely and fully human, with the same physical architecture as any other human brain, while His soul remained sinless. The physical susceptibility to temptation was real (His brain produced genuine impulses and desires), but the soul was the seat of moral agency, and the soul — empowered by the Holy Spirit — consistently chose obedience. The body provided the occasion for temptation; the soul provided the response. This is why Christ's temptation was genuine (His body and brain experienced the pull of temptation) and why His sinlessness was genuine (His soul, sustained by the Spirit, never yielded).

This is not Pelagianism. Christ's sinlessness was not the result of mere human willpower. It depended on two uniquely supernatural factors: (1) the unique creative act of God in forming His soul without the corruption of original sin, and (2) the ongoing empowerment of the Holy Spirit, who sustained Christ's human will in its sinless state. No other human being has either of these advantages. We are born with corrupted souls, and we do not have the unique hypostatic union with the divine nature that Christ enjoyed. Christ's sinlessness is therefore explained not by natural human capacity but by supernatural divine action — which is precisely what distinguishes the orthodox position from Pelagianism.

The Kryptic Model and Christ's Sinlessness

Andrew Loke's Kryptic Model of the Incarnation provides additional resources for understanding Christ's sinlessness within a dualist framework. On Loke's model, the divine attributes of omniscience, omnipotence, and omnipresence were not surrendered at the Incarnation (as kenoticism claims) but were concealed (krypsis) — present at a "preconscious" level but not actively accessed in Christ's waking human consciousness unless the Father willed it.²⁷

How does this relate to sinlessness? On the kryptic model, Christ's human soul operated with a genuinely human consciousness. He experienced temptation from a human standpoint — He felt the pull, the desire, the struggle. His divine knowledge did not flood His human awareness in a way that would have made temptation meaningless. But at the preconscious level, the divine nature was present, sustaining and empowering the human will. The human will was genuinely free — it was not overridden or coerced by the divine nature — but it was supported, strengthened, and sustained by the Spirit's work on the soul. Christ could have sinned in the abstract (His human nature, considered in itself, was posse peccare — able to sin), but the union of His human soul with the divine nature through the hypostatic union, and the empowerment of the Spirit, ensured that He never actually sinned (non posse peccare — not able to sin, as a matter of the actual outcome).²⁸

This is the Augustinian-Thomistic tradition's classic distinction, and it fits naturally within the kryptic model. As Crisp discusses in Divinity and Humanity, the classical view is that Christ's human nature was constituted such that it was capable of sinning in itself, but it was rendered incapable of sinning by virtue of its hypostatic union with the Word. The Word sanctified and preserved the human nature, not by destroying its freedom, but by perfecting it.²⁹ The Third Council of Constantinople (681) affirmed this when it declared that Christ's human will was not "destroyed by being made divine, but rather was preserved," and that the human will was "subject to his divine and all-powerful will" — not by coercion, but by willing harmony.³⁰

Notice how all of this requires a soul. The human will that freely submits to the divine will is a faculty of the soul, not the brain. The moral agency that makes temptation genuine is a function of the soul's capacity to desire, deliberate, and choose. The Spirit's work in sustaining Christ's human will is directed at the soul — the inner, immaterial dimension of His person. Remove the soul, and the entire framework collapses. Without a soul, there is no human will (only brain states), no genuine moral agency (only neural configurations), and no place for the Spirit to work (only neurons to manipulate). Physicalism strips away the very components that make a coherent account of Christ's sinlessness possible.

Physicalism and Sanctification: The Broader Pelagian Problem

The Pelagian problem for physicalism extends beyond Christ's sinlessness to the entire doctrine of sanctification — the process by which ordinary believers grow in holiness and become more like Christ. R. Scott Smith, in his essay "Sanctification and Physicalism" in Christian Physicalism?, argues that physicalism fundamentally undermines the doctrine of sanctification by making genuine moral and spiritual transformation impossible.³¹

Smith's argument proceeds along several lines. First, he observes that sanctification, as Scripture describes it, necessarily involves interpersonal relationships — deep, intimate union with Christ and with other believers. We are to "have the mind of Christ" (1 Corinthians 2:16), to "know the love of Christ that surpasses knowledge" (Ephesians 3:19), to grow into the "measure of the stature of the fullness of Christ" (Ephesians 4:13). All of this requires the kind of mental states that have genuine intentionality — thoughts that are genuinely of and about their objects. I must be able to have real thoughts about Christ, real desires directed toward Him, real knowledge of what is on His heart and mind.

But on physicalism, as Smith argues, genuine intentionality is impossible. If all mental states are physical states, then they are just patterns of neural firing. And patterns of neural firing, considered as physical events, are not genuinely about anything. They do not point beyond themselves to objects in the world. They are just configurations of matter in motion. This is the well-known problem of intentionality that philosophers of mind have wrestled with for decades, and it applies directly to the Christian doctrine of sanctification. If my thoughts about Christ are just neural firings, they are not really about Christ in any genuine sense. And if they are not genuinely about Christ, then I cannot really know Him, love Him, or grow in relationship with Him.³²

Second, Smith observes that sanctification requires moral transformation — the development of genuine virtues like love, patience, kindness, and self-control. On the received Christian tradition, these virtues are properties of the soul. They are real qualities that inhere in the immaterial dimension of the person. On physicalism, however, virtues can only be brain states — particular configurations of neural wiring. "Growing in patience" just means "rewiring your neural pathways so that your amygdala fires less and your prefrontal cortex fires more." But is that really what we mean by growing in holiness? Is sanctification really just neural rewiring? This seems to trivialize the profound spiritual reality that Scripture describes.³³

Third, and most importantly for our purposes, Smith points out that physicalism lacks a robust role for the Holy Spirit in sanctification. Brandon Rickabaugh and C. Stephen Evans make a similar observation in their essay in the same volume: the Christian physicalist account of spiritual formation that Warren Brown and Brad Strawn propose lacks any meaningful role for the Spirit's active work. All the work is done by social networks, church communities, and self-organizing systems. But Scripture is clear that it is the Holy Spirit who is the empowering and transformational agent of sanctification (1 Corinthians 6:11; Galatians 5:16–24; 2 Thessalonians 2:13). On physicalism, the Spirit can only work by manipulating brain states — but this is precisely the kind of mechanical, deterministic intervention that undermines genuine moral agency and free choice.³⁴

The connection to Christ's sinlessness is direct. If sanctification in believers requires the Spirit's supernatural work on the soul (as the church has always taught), then Christ's sinlessness — which is the supreme instance of human holiness — also requires the Spirit's work on the soul. And if there is no soul for the Spirit to work on, then neither Christ's sinlessness nor our sanctification can be adequately explained.

Wilkinson's Chalcedonian Anthropology and the Sinlessness Question

Michael Wilkinson's groundbreaking work on Chalcedonian anthropology — the view that our understanding of human nature should be governed by the Christological definitions of Chalcedon — has profound implications for the sinlessness question. As we discussed in Chapter 7, Wilkinson argues that the man Jesus Christ, as the man par excellence, must govern how we define the creation of man par ordinaire.³⁵

The Chalcedonian Definition tells us that Christ's human nature consists of a "body and rational soul" (sōma and psychē logikē). The person-nature ontology of Christ — a divine person subsisting in a human nature composed of body and soul — is the paradigm for understanding all human beings. If Christ, the definitive human being, has a soul, then human beings have souls. Any anthropology that denies the soul is not just philosophically problematic; it is Christologically inadequate.³⁶

Now apply this to sinlessness. On the Chalcedonian model, Christ's sinlessness is a function of His person-nature constitution. The divine person of the Son subsists in and acts through His human nature (body and soul). The person is the acting subject — not the nature. When Christ resists temptation, it is the divine person of the Son who acts through His human will. The human will genuinely wills obedience (this is not a mere puppet show), but the person who wills through that human will is the eternal Son of God, who is impeccable by nature. The human will, as a faculty of the human soul, is the locus of moral agency. And the divine person ensures that this will is always directed toward obedience, not by overriding it, but by sustaining it in righteousness through the Spirit.³⁷

On physicalism, this entire framework disappears. There is no human soul with a human will. There is only a brain. There is no person-nature distinction in the robust Chalcedonian sense, because on physicalism, the "nature" (the body) is the person. The acting subject is the brain, not an immaterial person or soul. And if the brain is the acting subject, then Christ's moral agency is located entirely in His neural activity — which brings us right back to the Pelagian dilemma.

Impeccability, Temptation, and the Dualist Advantage

One of the most perplexing questions in Christology is how Christ can be both impeccable (unable to sin) and genuinely tempted. If He could not sin, was His temptation real? And if His temptation was real, could He have sinned? Timothy Pawl addresses this puzzle directly in In Defense of Conciliar Christology, noting that "to be tempted, many hold, at least entails the possibility of falling into the temptation, that is, of sinning. And impeccability precludes that very same possibility."³⁸

The standard resolution — which I believe is correct — involves a distinction between what the human nature can do considered in itself and what it can do as united to the divine nature in the hypostatic union. Considered in itself, Christ's human nature was able to sin (posse peccare). His human will, as a genuine human faculty, had the intrinsic capacity for disobedience — just as Adam's did before the fall. This is what made His temptation genuine. He really could have wanted to avoid the cross. He really did feel the pull of self-preservation. His human soul experienced authentic moral struggle.

But as united to the divine nature, Christ's human will was incapable of actually sinning (non posse peccare). The divine nature — specifically, the divine person of the Son — ensured that the human will would always choose obedience. Not by coercion, but by the perfecting influence of the divine love and holiness that permeated the hypostatic union. The human will freely submitted to the divine will — as the Third Council of Constantinople declared — not because it was forced, but because the union with the divine nature perfected its freedom rather than destroying it.³⁹

This resolution requires dualism. It requires a human soul with a human will — a genuine faculty of moral agency that can be tempted, that can desire, that can choose. And it requires the hypostatic union to involve a genuine union between the divine person and the human soul — not just the human body. The divine person sustains the human soul in righteousness. The Spirit empowers the human will to choose obedience. The soul is the theater where the drama of temptation and obedience plays out.

On physicalism, there is no human will apart from brain states. There is no soul for the divine person to sustain. There is no "inner life" where temptation is experienced and overcome. There are only neurons firing in patterns — and the question of whether a particular pattern counts as "sin" or "righteousness" becomes a question of neural configuration rather than moral agency. This is not a satisfying account of what happened in Gethsemane.

Responding to Physicalist Objections

Let me now consider several responses that physicalists might offer to the arguments of this chapter. I want to be fair to these responses and engage them seriously before explaining why I believe they fail.

Objection 1: "God Could Simply Sustain Christ's Brain in Righteous States"

A physicalist might argue that God can work directly on the brain without needing an immaterial soul. Perhaps the Holy Spirit supernaturally influenced Christ's brain, sustaining the neural configurations associated with righteous choice and preventing the configurations associated with sin. On this view, Christ's brain was genuinely human, but God's supernatural action on the brain prevented sin.

I have already touched on this objection, but let me press it further. There are three problems with this response.

First, if God is directly manipulating brain states, then Christ's moral choices are not genuinely free. They are the product of divine neurological intervention. Christ's human agency is bypassed. He is not choosing obedience; God is choosing obedience for Him by arranging His neurons. This is not the free submission of the human will to the divine will that Constantinople III affirms. It is puppet-mastery — the divine person pulling the strings of the human brain. Genuine moral agency requires that the agent — not an external manipulator — is the source of the choice. On dualism, the soul is the agent, and the Spirit empowers the soul without overriding it. On physicalism, God must directly manipulate the brain, which is the only locus of agency, making Christ a puppet rather than a free moral agent.⁴⁰

Second, this response does not avoid the Pelagian problem — it just relocates it. If God prevents sin by manipulating brain states, then sinlessness is not a function of Christ's human nature (or human choices) at all. It is a function of God's external intervention. But then Christ's sinlessness tells us nothing about what human nature can or should be. He was sinless not because His human nature was righteous but because God was constantly intervening in His brain. This actually undermines the soteriological significance of Christ's sinlessness. The whole point is that Christ was righteous as a man — that His human obedience earned our salvation. If His obedience was really God's obedience (achieved by divine manipulation of His brain), then it was not genuine human obedience at all.

Third, and more practically, if God can prevent sin by manipulating brain states, why doesn't He do this for everyone? Why does God allow any human being to sin if He has the power to simply adjust their neural configurations? The problem of evil becomes much more acute if God has a mechanism for preventing sin (brain manipulation) and simply chooses not to use it for most people. On dualism, the answer is clear: God respects the genuine freedom of the soul, which He does not coercively manipulate. On physicalism, the only way God can prevent sin is by manipulating the brain — which is coercive — making the problem of evil much harder to solve.

Objection 2: "Physicalism Does Not Require That Sin Is a Brain State"

Some nonreductive physicalists might argue that while mental properties supervene on physical properties, they are not identical to physical properties. Sin, on this view, is a "higher-level" property that emerges from the physical but is not reducible to it. Therefore, the Pelagian argument does not apply, because sin is not just a brain state.

But this response does not solve the problem. Even on nonreductive physicalism, mental properties supervene on physical properties with nomological necessity. This means that for any higher-level mental property (such as "choosing to sin"), there exists a lower-level physical property (a brain state) that necessitates it. The mental property may not be identical to the brain state, but it is necessitated by it. And if it is necessitated by a brain state, then in principle it can be produced by producing the relevant brain state through physical means. The Pelagian problem survives intact. Hart's argument about the neuroscientist and the Faith Pill applies equally to nonreductive physicalism, because the supervenience relation still holds.⁴¹

As Nancey Murphy, one of the most prominent Christian physicalists, herself admits, on her nonreductive physicalism the soul is merely "a functional capacity of a complex physical organism" — not a separate, immaterial essence.⁴² If the soul is a function of the body, then every capacity traditionally attributed to the soul — including moral agency, the will, and the capacity for faith — is ultimately a function of the body. And if it is a function of the body, it is in principle physically manipulable. The Pelagian problem remains.

Objection 3: "Dualism Has Its Own Problems with Sinlessness"

A physicalist might turn the tables and argue that dualism has its own difficulties explaining Christ's sinlessness. If Christ had a genuine human soul with genuine human freedom, and if His soul was posse peccare (able to sin in itself), then what prevented Him from sinning? How is the dualist's explanation — "the Spirit sustained His soul" — any different from the physicalist's — "God sustained His brain"?

This is a fair question, and I want to answer it carefully. The key difference lies in the nature of the interaction between God and the human person. On dualism, the Spirit's work on the soul is a spiritual act — a communion between the divine Spirit and the human spirit. It operates at the level of the person's inner life, engaging the will, illuminating the mind, and strengthening the desires toward righteousness. This is the kind of interaction that Scripture describes when it speaks of the Spirit "bearing witness with our spirit" (Romans 8:16), or "shedding abroad the love of God in our hearts" (Romans 5:5), or producing the "fruit of the Spirit" (Galatians 5:22–23). It is a personal, relational interaction — not a mechanical manipulation.

On physicalism, God's interaction with the human person can only be a physical intervention in brain states. There is no spirit for the Spirit to commune with. There is no inner life to illuminate. There is only neural circuitry to rewire. The difference is not trivial. One is a personal relationship between the divine Spirit and the human soul. The other is a mechanical adjustment of a biological machine. One preserves and perfects human freedom. The other bypasses it.⁴³

Moreover, on dualism, the explanation for Christ's sinlessness involves His unique person-nature constitution. He is not just any human person — He is the divine Son of God subsisting in a human nature. The hypostatic union — the union of the divine person with the human soul and body — is what grounds His impeccability. It is not merely that God helps Him from the outside (as God helps us through the Spirit). It is that the very person who acts through the human nature is the eternal, impeccable Son of God. This is a metaphysical ground for sinlessness that goes beyond mere divine assistance. And it is a ground that only dualism can provide, because it requires a human soul that is united to the divine person in the hypostatic union. On physicalism, the Son is united to a body — but there is no soul to unite with, and the person-nature distinction that makes the hypostatic union intelligible becomes much harder to maintain.

Objection 4: "The Externalist Escape"

Hart anticipates another physicalist response: the appeal to causal-content externalism about mental states. On this view, what makes a mental state genuinely "about" something is not its intrinsic features (brain state) but its external causal relations to the world. Faith, on this view, is only truly faith if it involves the right kind of causal relationship to God. A neuroscientist's pill might produce the same internal brain state, but it would not be genuine faith because it lacks the proper causal history — it was not caused by God.

Hart responds effectively to this objection. He notes that even if externalism about content is granted, there remains an intrinsic dimension to faith — what he calls the "categorical" or dispositional aspect. Faith is not just a past decision; it is a present state of the person — a settled disposition of trust, commitment, and reliance on God. Even if the externalist can argue that the initial decision to believe requires a proper causal connection to God, the ongoing dispositional state is an intrinsic feature of the person. And on physicalism, this intrinsic state is a brain state — which means it is in principle producible by physical means. The externalist escape does not close the door to the Pelagian problem.⁴⁴

Furthermore, Hart observes that even if we grant that the neuroscientist's "faith" is not genuine faith (because it lacks the proper causal history), the people who have this artificial faith would come before God at the judgment full of sincere trust and devotion — indistinguishable from genuine believers in every experiential respect. For God to damn them solely because their faith had a curious causal origin seems deeply unjust. If their subjective experience of faith is identical to that of genuine believers, it is hard to see how God could treat them differently without arbitrariness. This suggests that, in practice, the externalist distinction would collapse — and Pelagianism would follow after all.⁴⁵

The Dualist Account: A Coherent Explanation of Christ's Sinlessness

Let me now pull together the positive dualist account of Christ's sinlessness. I believe this account is coherent, biblical, and consistent with the ecumenical councils. It avoids both the Pelagian heresy and the denial of Christ's genuine humanity. And it depends essentially on the existence of the immaterial human soul.

On substance dualism, Christ's sinlessness is explained by the following factors working together:

First, the unique creation of Christ's human soul. Every other human soul is either generated from parental souls (on traducianism) or created by God in conjunction with a fallen body (on creationism) and receives the corruption of original sin. Christ's soul, however, was directly created by God without this corruption. His soul was like Adam's before the fall — genuinely human but uncorrupted, with the full capacity for moral agency but without the disposition toward sin that marks fallen humanity. This is not a denial of Christ's genuine humanity, because fallenness is not essential to humanity. Adam was human before the fall. Christ's human nature is like Adam's — unfallen, but genuinely and completely human.⁴⁶

Second, the empowerment of the Holy Spirit. Throughout His earthly life, Christ's human soul was sustained and empowered by the Holy Spirit. The Spirit rested on Him from the moment of His conception (Luke 1:35), anointed Him at His baptism (Luke 3:22), led Him into the wilderness (Luke 4:1), and empowered His entire ministry (Acts 10:38). This is not mere external assistance; it is the intimate communion of the divine Spirit with the human soul — strengthening the will, illuminating the mind, and sustaining the desires in righteousness. The Spirit's empowerment is directed at the soul — the inner, spiritual dimension of Christ's humanity — not at the brain as a physical organ.⁴⁷

Third, the hypostatic union itself. Christ's human soul is united to the divine nature in the person of the eternal Son. The acting subject of Christ's human nature is not a created human person but the divine person of the Son. When Christ's human will chooses obedience, it is the Son who wills through the human will. The divine person does not override the human will but perfects it — sustaining it in its natural orientation toward the good, which is how unfallen human nature was designed to function. As the kryptic model explains, the divine attributes are present at the preconscious level, providing a foundation of stability and righteousness for the human conscious experience without overwhelming it.⁴⁸

Fourth, genuine moral agency. Despite all of the above, Christ's human will was genuinely free. He was not a robot programmed to obey. His obedience was a genuine human achievement — a free, willing, loving submission of the human will to the Father's will. "Not my will, but yours be done" (Luke 22:42) — this was not a pre-programmed response. It was the cry of a human soul in agony, choosing obedience through suffering. As discussed in Chapter 14, dyothelitism (the doctrine of Christ's two wills) requires that the human will is a genuine faculty that genuinely wills — and this requires a genuine human soul.⁴⁹

Christ's Sinlessness and the Atonement

Before we conclude, I want to briefly highlight why this matters so much for the gospel. Christ's sinlessness is not a theological decoration — a nice feature that we can take or leave. It is foundational to the atonement. Without Christ's sinlessness, there is no gospel.

The sacrificial system of the Old Testament required a spotless lamb — an animal without blemish (Exodus 12:5; Leviticus 1:3, 10; 4:3, 23, 28, 32). This requirement pointed forward to Christ, "the Lamb of God, who takes away the sin of the world" (John 1:29). Peter explicitly connects Christ's sinlessness to His redemptive work: "You were ransomed from the futile ways inherited from your forefathers, not with perishable things such as silver or gold, but with the precious blood of Christ, like that of a lamb without blemish or spot" (1 Peter 1:18–19). The "lamb without blemish or spot" is the sinless Christ. If He had been blemished — if He had sinned — His blood would not have been "precious" in the required sense. He could not have been our substitute.⁵⁰

Paul makes the connection even more explicit in 2 Corinthians 5:21: God made Him who "knew no sin" to be sin for us, so that in Him we might become the righteousness of God. The logic is clear: Christ's sinlessness is the precondition for His substitutionary work. He stands in our place precisely because He is without the guilt that we carry. If physicalism cannot adequately explain Christ's sinlessness — and I have argued that it cannot — then physicalism threatens the very foundation of the gospel.

Furthermore, Christ's sinlessness has ongoing significance for His priestly ministry. Hebrews tells us that Christ is our "high priest, holy, innocent, unstained, separated from sinners, and exalted above the heavens" (Hebrews 7:26). His present intercession for us (Hebrews 7:25) depends on His perfect righteousness. He represents us before the Father not as one who shares our guilt but as one who has overcome our condition from the inside — a genuine human being who lived a sinless life in genuine solidarity with us. This ongoing priestly work presupposes both Christ's genuine humanity (He must be one of us to represent us) and His sinlessness (He must be pure to stand before God on our behalf). Physicalism jeopardizes both.

The Connection to Earlier Arguments

The sinlessness argument strengthens and connects to several other arguments we have made in earlier chapters. As argued in Chapter 21, physicalism creates a devastating problem for the hypostatic union during the triduum mortis — the three days between Christ's death and resurrection. If there is no soul to survive death, the Incarnation was interrupted at the cross.⁵¹ As argued in Chapter 22, the death of Christ on physicalism effectively dissolves the hypostatic union, because the Son is no longer united to anything human. As argued in Chapter 24, the resurrection creates a fatal personal identity problem on physicalism — if Jesus ceased to exist at death and was "re-created" at the resurrection, is the risen Jesus the same person or a replica?⁵²

The sinlessness argument adds another layer to this cumulative case. On physicalism, Christ's sinlessness is either inexplicable (if His brain was normal), or it compromises His genuine humanity (if His brain was different), or it implies Pelagianism (if sinlessness is achievable through natural brain function). This is not an isolated problem. It is part of a pattern. At every critical juncture of Christology — the triduum, the descent, the resurrection, the ascension, and now sinlessness — physicalism fails to provide an adequate account. The pattern is not a coincidence. It reflects a fundamental incompatibility between physicalism and orthodox Christology.

As we argued in Chapter 20, physicalism, taken consistently, produces a Christology that the ecumenical councils would have condemned. It is, in effect, a new form of Apollinarianism — not because physicalists intend to deny Christ's humanity, but because their denial of the immaterial soul produces the same structural result: an incomplete human nature that cannot sustain the weight of the Incarnation.⁵³

Conclusion: The Soul Makes Sinlessness Possible

We have covered a great deal of ground in this chapter, so let me draw the threads together.

The New Testament is clear that Jesus Christ was genuinely tempted and perfectly sinless. His temptation was real — comprehensive, painful, and costly. His sinlessness was total — extending to actions, words, thoughts, and the deepest posture of His being. And His sinlessness is foundational to the atonement, the priesthood, and the gospel itself.

Physicalism cannot adequately explain this. If sin is a function of brain states, and Christ had a normal human brain, then physicalism faces a dilemma with no satisfying resolution. Horn 1: Christ's brain was different from ours — but then He did not truly share our nature, His temptation was not genuine, and Gregory's axiom condemns this as a failure of the Incarnation. Horn 2: Christ's brain was the same as ours — but then His sinlessness through natural brain function implies Pelagianism, the heresy that human beings can achieve moral perfection through their own powers. Every attempt to escape this dilemma — divine manipulation of brain states, nonreductive emergence, externalism about mental content — creates additional problems without solving the original dilemma.

The problem deepens when we consider original sin. On physicalism, original sin must be transmitted through physical means — genes, brain structure, or social conditioning. But each of these options either forces original sin onto Christ (contradicting His sinlessness), exempts Him from the normal human condition (compromising His genuine humanity), or reduces original sin to mere social influence (which is Pelagianism).

Substance dualism, by contrast, provides a coherent, biblical, and creedally faithful account. Christ's human soul was directly created by God without original sin. The Holy Spirit empowered and sustained that soul throughout His earthly life. And the hypostatic union — the union of the divine person of the Son with the human soul — grounded His impeccability while preserving the genuine freedom of His human will. This is not Pelagianism, because Christ's sinlessness depends entirely on supernatural divine action — the unique creation of His soul, the Spirit's empowerment, and the hypostatic union. And it is not a compromise of His genuine humanity, because His human nature — body and soul — was fully and truly human, consubstantial with ours in every respect except sin.

I believe the evidence is clear. The doctrine of Christ's sinlessness — one of the most precious truths of the Christian faith — requires the human soul. Without a soul, we cannot explain how Christ was genuinely tempted, how He avoided sin, how He was exempt from original sin while remaining fully human, or how the Spirit sustained His human will in righteousness. The soul makes sinlessness possible. And the soul is precisely what physicalism denies.

As I said at the beginning of this chapter, this is not just an academic debate. It is about the gospel. If Christ was not genuinely sinless — if His sinlessness was a sham, or a neurological fluke, or a divine puppet show — then His death on the cross cannot atone for our sins. The spotless Lamb must truly be spotless. And the spotlessness of the Lamb requires a soul.

Bibliography