Chapter 12

The Rejection of Apollinarianism — Why the Church Insisted Christ Has a Human Soul

Most heresies in church history were ruled out for one main reason. Apollinarianism was ruled out for many. The early church did not stumble into rejecting this teaching almost by accident. The bishops, the synods, and finally the ecumenical councils kept coming back to it, condemning it again and again — at Alexandria in 362, Rome in 377, Constantinople in 381, and reaffirmed at Chalcedon in 451 and Constantinople II in 553.¹ When the church says something five times, it is not because the matter is unclear. It is because the matter is settled, and the church wants no one to miss it.

What did Apollinarius teach that worried the church so deeply? In short, he taught that Christ had a human body but no human rational soul. The eternal Son, in becoming flesh, took the place of the soul-mind that you and I have. Apollinarius believed he was protecting the unity of Christ. Instead, he was emptying Christ of part of His humanity. And the church's response to him is one of the most important moments in Christian history — partly because of what it tells us about Christ, and partly because of what it tells us about ourselves.

I want to argue something specific in this chapter. The early church's vigorous rejection of Apollinarianism shows that the complete humanity of Christ — body and immaterial soul — has been a non-negotiable element of orthodoxy since the fourth century. And modern physicalism about human nature, however well-intended, is structurally parallel to the very heresy the church condemned. Apollinarius denied that Christ had a human soul. The Christian physicalist denies that any human being has an immaterial soul at all. The Christological result is the same: Christ ends up without one. This parallel is the heart of what I want to show.

Who Was Apollinarius, and What Did He Actually Teach?

Apollinarius of Laodicea (c. 310–390) was no fringe figure. He was a bishop, a friend of Athanasius, a defender of Nicene orthodoxy against the Arians, and one of the sharpest theological minds of his generation.² He believed Christ was fully God, against the Arians who said the Son was a creature. He believed there is one Christ, not two. He took the unity of the incarnate Son with utmost seriousness. He was, in short, trying to be orthodox. That is part of what makes the story so sobering.

Apollinarius worked with a tripartite (three-part) anthropology drawn from common Greek philosophical assumptions of his day. A human being, he taught, is composed of three things: a body (sōma), a lower animal soul (psychē) that handles biological life, and a rational mind or spirit (nous, νοῦς) that does the thinking, willing, and choosing.³ The nous, in his framework, is what makes a human a human. It is the seat of personhood, agency, and direction. Without it, you have a living animal but not a person.

Now apply that to Christ. If Christ has a complete human nous, Apollinarius reasoned, then He has two rational minds — a divine one (the Logos) and a human one. And two rational minds, on his framework, mean two persons. Two persons in Christ would be a disaster. So Apollinarius solved the puzzle by removing one of the minds. The Logos, he said, took the place of the human nous. Christ has a human body, perhaps a lower animal soul for breathing and digesting and feeling pain, but the rational soul — the part that thinks, decides, and prays — is the Logos Himself.⁴

You can see the appeal. One mind, one will, one Person. No two-headed Jesus. No risk of Nestorianism (the heresy that splits Christ into two persons). For Apollinarius, this was the elegant solution. As Michael Wilkinson observes, Apollinarius's framework gave his Christology "a prima facie coherence that was logically satisfying on the surface."⁵ But surface coherence is not depth. The price he paid was catastrophic. He had bought the unity of Christ at the cost of His humanity.

Gregory of Nazianzus and the Most Important Sentence in Christology

If you read only one sentence from the entire Apollinarian controversy, read this one. It is from a letter Gregory of Nazianzus wrote around the year 382 to a priest named Cledonius, dealing precisely with the followers of Apollinarius. Gregory writes:

For that which He has not assumed He has not healed; but that which is united to His Godhead is also saved.⁶

The Greek phrase is to gar aproslēpton, atherapeuton (τὸ γὰρ ἀπρόσληπτον, ἀθεράπευτον). Literally: "what is not taken up is not healed." It is one of the great economical sentences in Christian theology — packing a complete soteriological argument into seven Greek words. Let me unfold what Gregory is doing.

His argument runs in five steps, and I find it persuasive at every turn. First, human beings need to be saved as we actually are — body and soul, flesh and mind. Sin, suffering, and death have not damaged only our bodies. Our minds, our wills, our affections — every part of us is broken. Second, redemption requires assumption. The Son saves what He takes on. He does not save from the outside; He saves by becoming. Third, if Christ did not assume a human rational soul, then the human rational soul is not redeemed. It remains untouched by the Incarnation. Fourth, the human rational soul is not a peripheral part of us. It is the seat of sin, the seat of moral choice, the seat of our broken relationship with God. To leave it unredeemed is to leave the very heart of the problem unaddressed. Fifth, therefore Apollinarianism defeats the purpose of the Incarnation. A Savior who heals only the body has not healed us, because we are not only bodies.⁷

Gregory drives the point home with a vivid line in the same letter: "If only half Adam fell, then that which Christ assumes and saves may be half also; but if the whole of his nature fell, it must be united to the whole nature of Him that was begotten, and so be saved as a whole."⁸ Half a Savior for half a problem. That is what Apollinarianism gives us. The whole problem demands a whole Savior — body and soul.

Notice what Gregory's principle does not require. It does not require us to accept some particular philosophy of mind. It simply requires us to take human nature as it actually is — body and soul, flesh and mind — and to say that all of it stood in need of being saved, and therefore all of it had to be assumed. As we will see in a moment, this is exactly where physicalism runs into trouble.

Other Orthodox Voices: Nyssa, Athanasius, and the Antiochenes

Gregory of Nazianzus was not alone. His friend Gregory of Nyssa wrote an entire treatise against Apollinarius — the Antirrheticus adversus Apollinarem ("Refutation of Apollinarius"). Nyssa's argument cuts even sharper in some ways. He pointed out that what Apollinarius offers us is not really a human being at all. A body without a rational soul is, by every ancient standard, an animal. So the Apollinarian Christ is not God-with-us in human form; He is the Logos joined to a kind of living animal flesh.⁹ Nyssa called this a kind of theological monstrosity — neither fully God nor fully man, but a hybrid.

Athanasius, in On the Incarnation and elsewhere, repeatedly insisted that the Word assumed a complete human nature. Basil of Caesarea pressed the same point. The Antiochene theologians, despite all their other quarrels with the Alexandrians, agreed that Apollinarianism stripped Christ of His true humanity.¹⁰ What I find striking is the breadth of the opposition. East and West, Alexandrian and Antiochene, philosophical theologians and pastoral bishops — they all said the same thing. Christ has a human soul. Anyone who denies that has wandered out of orthodoxy.

This breadth matters because it shows that the rejection of Apollinarianism was not a narrow technical dispute. It was a unifying conviction. Even theologians who disagreed about almost everything else agreed about this. As I will note in Chapter 30, no significant church father between Irenaeus and John of Damascus held anything like a position that denied Christ a human soul. The patristic consensus is overwhelming.

The Conciliar Condemnations

The councils gathered up this consensus and made it law for the church. Apollinarianism was first formally condemned at the Synod of Alexandria (362), then at the Council of Rome under Pope Damasus (377), and most decisively at the First Council of Constantinople (381) — the council that gave us the expanded form of the Nicene Creed.¹¹ The Creed's confession that the Son "became man" (enanthrōpēsanta) was deliberately chosen against Apollinarius, who would have preferred that the Word merely "became flesh" (sarkōthenta). To become flesh might mean only assuming a body. To become man means assuming everything that makes us human.

Chalcedon (451) sealed the matter for all time. As I argued in Chapter 11, the Definition of Chalcedon explicitly affirms that Christ is "truly man of a rational soul (ek psychēs logikēs, ἐκ ψυχῆς λογικῆς) and a body."¹² That phrase — "rational soul and a body" — is not decorative. It is a deliberate, surgical strike against Apollinarianism. The council fathers wanted to make sure that no one could ever again read the Christian confession and conclude that Christ had only a body. He has a rational soul. The Greek psychē logikē means exactly what it says: a thinking, reasoning, immaterial soul. Constantinople II in 553 reinforced the point with explicit anathemas, and Pawl rightly notes that on the conciliar definitions, "the Word would unite to flesh enlivened with a rational and intellectual soul."¹³ The councils could hardly have been clearer.

The Critical Parallel: Apollinarianism and Physicalism

Now we come to what I think is the most important argument of this chapter, and one I want to make as carefully as I can. I want to suggest that modern Christian physicalism — the view that human beings are purely physical organisms, with no immaterial soul — produces the same Christological result that Apollinarianism produced. The Christological result is that Christ ends up without an immaterial human soul.

Let me lay this out step by step.

Apollinarianism says: Christ has a human body, but the eternal Son replaces a human rational soul. Christ has no human nous. Physicalism (about human nature) says: there is no such thing as an immaterial soul anywhere; human beings are purely material organisms. Apply that to Christ. If physicalism is true and there is no soul to be had, then Christ — being human — has no immaterial human soul either. The route to the conclusion is different. Apollinarius gets there by replacement. The physicalist gets there by elimination. But the conclusion is identical: Christ does not have an immaterial human soul.

That is the parallel. Now I want to be fair about three things.

First, physicalists do not intend to be Apollinarian, and most would be horrified by the comparison. They believe they are affirming Christ's complete humanity, because they think a complete human nature just is a properly functioning human body and brain. From their perspective, denying the soul is not denying anything that human nature actually has — it is just denying a metaphysical extra that they find unnecessary. Joel Green, Nancey Murphy, Kevin Corcoran, Trenton Merricks, and others in this camp are sincere Christians trying to be biblical and orthodox.¹⁴ I want to honor that.

Second, the historical context is genuinely different. Apollinarius denied the soul in Christ specifically; physicalists deny the soul in all human beings. Apollinarius accepted the existence of immaterial souls in general — he just thought Christ did not have one because the Logos took its place. The physicalist's view is broader and more philosophical. So the parallel is not exact.

Third, some physicalists have tried to rescue the Chalcedonian phrase "rational soul" by reinterpreting it. Joshua Farris explains the move charitably: a physicalist might say the "rational soul" is just "a set of properties tied to a brain," so that the brain plays the role Chalcedon assigned to the soul.¹⁵ On this reading, physicalism does not deny that Christ has a "rational soul" — it just reinterprets the term so that a properly functioning brain counts.

I want to grant the physicalist all of this. But here is where I think the parallel still bites, and bites hard.

The councils were not debating words. They were debating realities. The councils' use of "rational soul" was deliberate, technical, and metaphysically loaded. As Wilkinson puts it, the conciliar definition affirms that "in his human nature, the same Son is 'perfect in manhood,' having both 'a rational soul and body' (contra Apollinarianism)."¹⁶ The fathers meant a real, immaterial faculty distinct from the body — a psychē logikē, an immaterial thinking thing. Reinterpreting that to mean "a property of brain matter" is not a translation; it is a substitution. It changes what the council affirmed. And the irony is sharp: Apollinarius, too, kept the language of "soul" in his system. He just emptied the language of its substance by letting the Logos play the role. The physicalist re-empties the language by letting brain function play the role. The councils' specific concern was that the role itself be filled by a real, immaterial human soul — not a divine substitute, not a neural substitute, but a genuinely human psychē logikē. As Farris notes, even on a "two-part materialist Christology" the fundamental Christological problem remains: "upon Christ's human body dying, Christ would cease to be human."¹⁷ That is exactly the kind of result the councils ruled out.

And there is more. Gregory's axiom presses the point: what is not assumed is not healed. On physicalism, what gets assumed is a body. The deepest dimensions of human brokenness — the disordered loves, the darkened mind, the willful rebellion — all of these, on a physicalist account, reduce ultimately to brain states. So perhaps the physicalist will say Christ heals our broken brain states by assuming a brain. But this misses what we actually mean by sin. Sin is not a chemical imbalance. It is a disordered relation between a person and God — and persons, on the orthodox view, are more than their neurons. To treat the soul as nothing more than a brain process is, in the end, not to redeem the soul at all but to redefine it out of existence. Wilkinson is right: if a complete human soul is not assumed, "the incarnate Son cannot redeem the soul of man and cannot save sinners."¹⁸

Counterarguments and Responses

I want to engage briefly with the strongest physicalist response. The response runs like this: "We are not Apollinarians. Apollinarius said Christ lacked something humans have. We say humans never had immaterial souls in the first place. So Christ's humanity, on our view, is complete — He has everything humans have." This is the rescue I mentioned above, and it is the heart of the physicalist defense.

I have two responses. First, the question of what humans actually have is exactly the question at issue throughout this book. As I argued in Chapters 3, 4, and 5 — and as the patristic tradition uniformly affirmed — Scripture, philosophy, and the data from veridical near-death experiences all converge on the conclusion that human beings really do have an immaterial soul. If that is right, then physicalism is mistaken about human nature, and Christ on physicalism does in fact lack something humans actually have. Second, even if we set aside that broader case for a moment, the conciliar definitions did not leave the meaning of "rational soul" up for grabs. Chalcedon meant psychē logikē in the technical, ontologically robust sense the patristic tradition had developed. Pawl is precise here: any view "that holds there to be no soul there, or holds the soul to be the Second Person, is a view inconsistent with Conciliar Christology."¹⁹ The first option is Apollinarianism; the second, I am suggesting, is functionally where physicalism ends up.

A second response sometimes offered is to push the worst problems off until later. "Yes, there might be issues with Holy Saturday and the Incarnation's continuity at death. But those are separate issues." They are indeed separate, and I take them up at length in Chapters 21 through 23. For now, I only note that the Apollinarian parallel does not depend on the triduum mortis arguments. It stands on its own. Even before Good Friday, the physicalist Christ has no immaterial human soul. The councils said He must have one. That is the issue here.

Conclusion: The Verdict of the Church

The early church faced a simple choice. Either Christ has a complete human nature — body and immaterial soul — or He does not. Apollinarius said He does not. Gregory of Nazianzus, Gregory of Nyssa, Athanasius, Basil, the Antiochenes, and finally the councils all said He does. The argument that won the day was Gregory's: what is not assumed is not healed. A Savior who took only a body would be a Savior of bodies only — and we, being more than bodies, would remain unsaved.

Modern Christian physicalism is, I believe, well-intentioned. But the question Christology asks is not what we intend; it is what our position entails. And what physicalism entails is a Christ without an immaterial human soul. The route to that conclusion differs from Apollinarius's route. But the destination is the same. And the destination is what the councils ruled out.

If I am right about this parallel, then the implication is significant. It is not just that physicalism faces certain Christological challenges (though it does, as the rest of this book will show). It is that physicalism's Christological result was already condemned, fifteen centuries ago, in some of the most carefully worded definitions the church has ever produced. That is a heavy weight to carry, and any Christian considering physicalism must reckon with it. The councils did not pass over Apollinarianism lightly. We should not pass over its modern parallel lightly either.