A correspondent wants to read this article, so here it is.
The Problem
According to Chalcedonian orthodoxy, Christians believe that God the Son, the second person of the Trinity, at a certain historical moment assumed human nature in Jesus of Nazareth, and did so without forsaking his divine nature. Orthodox Chalcedonian incarnationalism (hereafter, OCI) implies an identity thesis: the person who is the Son or Logos (Word) is (identically) the person who is Jesus of Nazareth. The Logos is believed to be one person existing in two distinct natures, the one divine, the other human. But this poses a problem, or more precisely, a trinity of tightly interconnected problems. (P1) How can one person, hence one individual, exemplify seemingly incompatible natures? (P2) How can one person exemplify seemingly incompatible non-nature properties? (P3) How can there be only one person or hypostasis if, as is arguable, the very concept of Incarnation implies that one person incarnates himself in, and as, another person?
The problems are distinct. (P1) would be solved if it were shown that the divine and human natures are compossible, i.e., possibly such as to be [Philo 85] exemplified by the same individual. But to solve (P1) is not to solve (P2). For there are properties not included in either the divine or human natures possession of which by one individual seems impossible. Among these are such modal properties as being essentially human and being accidentally human.[1] And solving (P1) and (P2) would not amount to solving (P3), since (P3) is not a problem about apparent discernibility.
The difficulty common to (P1) and (P2) may be cast in the mold of an inconsistent triad:
1. Necessarily, if two things are identical, they share all their (non-intentional)[2] properties.
2. God the Son and Jesus do not share all their (non-intentional) properties.
3. God the Son and Jesus are identical.
(1) is a version of the Indiscernibility of Identicals, which is surely very secure. (2) is true as a matter of Christian belief, since, for example, the Son is unlimited in power, but Jesus is not. But (1) and (2) jointly entail the negation of (3). So (3) is false given the truth of (1) and (2). Indeed, (3) is necessarily false on the plausible assumption that identity claims are necessarily true, if true, and necessarily false, if false.
This paper gives some reasons for thinking that (3) is indeed necessarily false, and that OCI, to the extent that it implies a claim of absolute numerical identity of the Logos and Jesus, is logically impossible. My aim is not to refute OCI, but to contribute to an appreciation of some of the challenges that a defender of OCI faces. A thorough evaluation of OCI would have to consider every extant response to the problem I am raising. This task, however, lies well beyond the scope of this article.
The Apollinarian Defense and the Ambiguity of ‘Incarnation’
Some will be tempted to circumvent the aporetic triad by downgrading the claim of absolute, formal, numerical identity in (3) to the sort of union that relates mind and body on a dualist scheme. It is not unusual to encounter adherents of OCI who succumb to this temptation. I will call this strategy the Apollinarian defense, in allusion to the heresy of Apollinaris of Laodicea. Apollinaris (310-390 A.D.) denied the existence of a rational soul in Jesus, and seems to have held that Jesus is a composite of Logos and human body, or of Logos and human body-cum-irrational soul.[3] So what the Apollinarian defender does is to interpret the Logos-Jesus relation as a special case of the mind-body relation, the case in which a divine mind manifests itself through a human body. This allows the Apollinarian defender to interpret (3) as asserting merely some sort of union of Logos and Jesus, a union shy of identity. Absolute, formal, numerical identity is totally reflexive, symmetrical, transitive, governed by the Indiscernibility of Identicals, and such that if x = y, then necessarily, x = y. Mind-body union is clearly a much ‘looser’ relation. For it is governed neither by the [Philo 86] Indiscernibility of Identicals, nor by the Necessity of Identity. One cannot show that mind and body in a particular person are not united by showing that they differ property-wise, nor by showing that the union holds only contingently.
The Apollinarian defender, therefore, evades the difficulty expressed in (1)-(3) by construing the Incarnation as a relation ‘looser’ than strict, formal, numerical identity. He also secures a second advantage. If the Incarnation is a special case of the familiar mind-body relation, then it is no more problematic than the latter. C. S. Lewis is a prominent example of an Apollinarian defender:
In what sense is it conceivable that eternal, self-existent Spirit . . . should be so combined with a natural human organism as to make one person? And this would be a fatal stumbling-block if we had not already discovered that in every human being a more than natural activity (the act of reasoning) and therefore presumably a more than natural agent is thus united with a part of nature...
...the difficulty which we felt in the mere idea of the Supernatural descending into the Natural is apparently nonexistent, or is at least overcome in the person of every man.[4]
What I take Lewis to be suggesting here is that (i) the Incarnation is a special case of the mind-body relation, the case in which the mind is self-existent spirit rather than created spirit; that therefore (ii) the Incarnation is no more problematic than the mind-body relation in us; and that (iii) the mind-body relation in us is not at all problematic since we know ourselves to be embodied minds. The problem with this, of course, is that (i) is false, as I shall further support below. The falsity of (i) also puts paid to the view of those Apollinarian defenders who argue, as I have heard it argued, that since reincarnation is a logical possibility, then so is the Incarnation.
Evidently, the Apollinarian defense draws aid and comfort from the ambiguity of ‘incarnation.’ The etymology of the term suggests a literal taking on of flesh as in John 1:14, “And the Word became flesh and dwelt among us.” The suggestion is that a disembodied mind or rational soul or person takes on or assumes a body (together, perhaps, with the body’s irrational soul or animating principle). Talk of reincarnation reflects this (Platonic) sense of ‘incarnation’ as embodiment. But this is not what Christians who understand their doctrine mean by ‘incarnation.’ What they mean is that a certain disembodied person, the Logos, takes on a man, so to speak, thereby assuming a human (hence rational) mind or soul and a human body. The two senses of ‘incarnation’ sustain at best an analogous relation one to the other. Thus we might say that the Logos is to the man Jesus as the mind of Socrates is to the philosopher’s body. Thus a divine mind is to a human mind-body composite as a human mind is to a human body. What we cannot say is that Incarnation in the specifically Christian sense is a special case of incarnation in the Platonic sense. Incarnation is a wholly unique ‘event’; part of its uniqueness consisting in its being a relation of identity rather than some such ‘looser’ relation as union.
In sum, the difficulty presented by our aporetic triad cannot be evaded [Philo 87] by an Apollinarian defense (except on pain of heresy), since it misconstrues the nature of the God-man tie, falsely assimilating it to the mind-body relation. And it goes without saying that those who compare the Logos-Jesus identity to the marital union haven’t even begun to appreciate the difficulty.[5]
Morrisian Maneuvers
Another way around the difficulty represented by our aporetic triad is by rejecting (2), the proposition that Jesus and the Son do not share all properties, while taking (3) full strength. There are at least two quite distinct sources of support for (2), corresponding to problems (P1) and (P2). The one to be discussed in this section is the suspicion that the divine and human natures are not compossible, i.e., not possibly such as to be exemplified by the same individual. For the divine nature includes such properties as being unlimited in power and being metaphysically necessary, whereas human nature would appear to preclude such properties. How then can one person be both fully human and fully divine?
Thomas V. Morris addresses this question in The Logic of God Incarnate, and he does so by drawing three distinctions. If I am right, however, his distinctions fail to do the work cut out for them.
The first distinction is that between common human properties and essential human properties.[6] No doubt there is a distinction. All humans have spent most of their lives on the surface of the earth; but this is merely common to, not part of the essence of, humans. There is nothing in the essence of humans to require that they remain earth-bound. Similarly, according to Morris, it is no part of the essence of humans that they begin to exist in time, and no part of their essence that they are possibly such as to have never existed at all.[7] Thus there is nothing in human nature to prevent something from being both human and a necessary being! Human nature does not entail metaphysical contingency, and so does not preclude metaphysical necessity. And so Jesus Christ can be unproblematically both fully human and fully divine, one person with two distinct natures. The first tactic of Morris, then, amounts to removing from human nature all of the offending “limitation properties,” e.g., metaphysical contingency. Despite initial appearances, a thing’s having human nature does not preclude it from having divine attributes.
But this raises a problem. Such properties as metaphysical contingency, unlike living on the surface of the earth, are not only common to their possessors, but also essential to them. Thus I don't merely happen to be a contingent being, I am essentially a contingent being. This is a consequence of the S5 system of modal logic according to which modal status is necessary. But Morris tells us that human nature does not preclude being metaphysically necessary. So if it is not human nature that bars me from the elite corps of necessary beings, what does? It must be a property P that satisfies two conditions: I have P essentially; P is not included in (entailed by) human nature.[8]
At this point Morris' second distinction comes into play, the merely [Philo 88] F/fully F distinction. The property P is that of being merely human. It is this property that bars me from the corps of necessary beings. I have the property of being merely human essentially, but this property is not entailed by a thing’s being fully human. Being merely human, it is essential to me that I be contingent; but something can be fully human without being contingent. Thus it is not essential to Jesus Christ that he be contingent, for he is fully human but not merely human.
It is not clear that this response works. For, as Morris says, “To be merely human is not to exemplify a kind-nature, a natural kind, distinct from that of humanity; it is rather to exemplify humanity without also exemplifying any ontologically higher kind, such as divinity.”[9] If mere humanity were a kind-nature that included such properties as being metaphysically contingent, then my being essentially merely human would entail my being essentially contingent. But mere humanity is not a kind-nature. Thus it is not clear how my being merely human makes it impossible for me to be a necessary being. Of course, being merely human guarantees that I am not a necessary being, but the intuition that needs to be satisfied is the intuition that I am necessarily not a necessary being. On the other hand, if a thing’s being (fully) human, and the properties it entails,[10] do not make it impossible for a thing to be a necessary being, it would appear that nothing makes it impossible, and that my contingent modal status is itself contingent, contra the strictures of S5.
Of course, given that I am non-divine, and non-abstract, it follows necessarily that I am a contingent being. But it does not follow that I am necessarily a contingent being. The necessity of the consequence is not the necessity of the consequent. We must distinguish
4. Necessarily, if x is merely human, then x is metaphysically contingent
from
5. If x is merely human, then, necessarily, x is metaphysically contingent.
I detect the confusion of (4) and (5) in Morris' text. He writes:
If contingency, coming into existence, and possibly ceasing to exist were essential human properties, the doctrine of the Incarnation would express a metaphysical, or broadly logical impossibility...
It may be that these, or at least two of these, properties are essential to being merely human. Any being which exemplifies human nature without also exemplifying divine nature would then have [my emphasis] to exemplify them...[11]
No doubt any being that exemplifies human nature without also exemplifying divine nature would exemplify metaphysical contingency, to take one of the properties mentioned. But it would not have to exemplify it unless being human entailed being metaphysically contingent, which Morris denies. “Contingency is ‘essential to being merely human’” — an [Philo 89] assertion which may be ascribed to Morris on the basis of the passage just quoted — is ambiguous as between (4) and (5). All Morris is entitled to assert is (4), and (4) is compatible with my being contingently metaphysically contingent, just as ‘Necessarily, all bachelors are unmarried’ is compatible with Klimosauskas the bachelor's being contingently unmarried. Let us not forget that being merely human is not a natural kind.
The difficulty may be summed up as follows. Being (fully) human, says Morris, does not entail being metaphysically contingent. So it is not in virtue of being (fully) human that I am metaphysically contingent, but in virtue of being merely human, which is to say: in virtue of not being divine. Now if I am essentially metaphysically contingent, as S5 demands, this must be chargeable to the account of my essentially not being divine. But this negation must be grounded in something positive. I am essentially non-divine because my essence precludes my being divine and thus entails my being contingent. If this isn't my human kind-essence, what is it?
This brings us to Morris' third distinction, that between kind-essences and individual-essences. Having excluded the limitation properties from the human kind-essence, he suggests that "Such properties may partially comprise our respective individual essences..."[12] But what work does this third distinction do? The limitation properties derive from our creature status. Now being a creature, if not a kind-essence, is surely a general essence. So individual essences are beside the point. In any case, being a creature includes the property P we were looking for, the property that ordinary humans have essentially and that includes the limitation properties.
But this issues in a dilemma. If God the Son assumes human nature without assuming any of the limitation properties, then the Son assumes human nature without assuming creature status. This horn is unacceptable, since as Morris points out, to take on human nature is to "take on a human body and a human mind," it is to "take on a created, contingent body and mind..."[13] But if the Son assumes creature status, then the original problem has not been solved. How can one person be both uncreated and created? Morris says in effect that the Son takes on a "contingent, created body and mind" without becoming a "created, contingent being."[14] How can this be, if the Son and Jesus are identical?[15]
So despite Morris' distinctions, it remains unclear how the two natures can be compossible. (P1) thus remains unsolved.
A Modalized Discernibility Objection
I said that there are two sources of support for (2), the proposition that God the Son and Jesus do not share all their (non-intentional) properties. The one just discussed is the putative noncompossibility of the divine and human natures. The other source of support for (2) is the topic of the present section. Setting aside the animadversions of the preceding section, let us irenically assume that (i) the two natures are compossible, that (ii) it is possible for one person to have two natures, and that (iii) there is no difficulty [Philo 90] with a person having one of its natures accidentally. If the divine and human natures are compossible, then perhaps no discernibility argument invoking unmodalized properties can be sound. But there are also arguments invoking modalized properties to contend with, e.g.:
6. God the Son is accidentally human.
7. Jesus is essentially human.
Therefore
8. God the Son is not identical with Jesus.
(6) is a commitment of orthodoxy since the Incarnation is a free, and indeed supererogatory act of divine agape and therefore an event that might not have occurred. (7) seems plainly true, since if Jesus is a human being, a 'true man' as the Chalcedonian definition has it, then he is essentially a human being. So the argument seems to show that the Son and Jesus cannot be numerically the same individual.
To defeat this argument, the proponent of OCI would have to reject (7) and hold that Jesus is accidentally human. But could this be done without begging the question? That depends on what it is to beg a question. By my lights, an argument begs the question if the propounder of the argument must know or have good reason to believe the conclusion to be true in order to know or have good reason to believe one or more of the premises to be true. So it seems to me that the argument from (6) and (7) to (8) does not beg the question against the proponent of OCI since even though (7) cannot be true unless (8) is true, one can have good reason to believe (7) to be true quite independently of (8). How? Well, if one believes, as is surely reasonable, that Jesus of Nazareth has a human nature, then one is entitled to infer that he has this nature essentially on pain of his not being fully and truly human.
On the other hand, the argument from (6) and the negation of (8) to the negation of (7) would beg the question against the critic of OCI. For the only reason one could have to believe anything as counterintuitive as the negation of (7) — Jesus is accidentally human — would be if one antecedently believed the negation of (8), to wit, God the Son is identical with Jesus.
Supposing the proponent of OCI does indeed beg the question against the critic, all this means is that he is in no position to persuade the critic, violating as he has a rule of ‘dialectics.’ It does not mean that the proponent's position is logically inconsistent or otherwise incoherent. The proponent is perhaps within his doxastic rights to enforce the indiscernibility of Logos and Jesus on the strength of his antecedent acceptance of the Logos-Jesus identity.
The Asymmetry of Incarnation and the Doctrine of Anhypostasia
So a further step is needed. To dislodge the proponent of OCI, the critic needs to uncover an incoherence internal to his position. I propose to do this by a bit of analysis of the concept of Incarnation. In so doing I address (P3), the problem of how there can be only one person or hypostasis.
The very intelligibility of the concept of Incarnation demands that we [Philo 91] distinguish between the agent and the locus of Incarnation. For if we did not make this or some cognate distinction, we would not be able to distinguish, as we must, between Jesus is the Incarnation of the Logos and The Logos is the Incarnation of Jesus. So in making the agent/locus distinction I beg no questions; I merely unpack what is implicit in the concept of Incarnation.
The agent is God the Son, the one who incarnates himself, and does so freely. The locus of Incarnation is the one in whom the Son incarnates himself. Now either the Son incarnates himself in himself, in which case agent and locus are identical, or he incarnates himself in another, in which case agent and locus are distinct. The first disjunct clearly makes nonsense of the very concept of the Incarnation. For the concept implies inter alia that a purely spiritual being enters into the material world. Hence a purely spiritual being cannot incarnate himself in himself, where ‘cannot’ expresses a conceptual impossibility. This leaves the second disjunct: The Son incarnates himself in another. This implies that the agent and the locus of Incarnation cannot be identical. Since in our world, the actual world, Jesus is the locus of Incarnation, it follows that God the Son and Jesus cannot be identical.
It follows that the proponent of OCI cannot support the rejection of (7) — Jesus is essentially human — by appeal to the identity of the Son and Jesus. For not only does such appeal beg the question against the critic, it also has the much more serious defect of violating the result of the last paragraph: to understand the concept of Incarnation is equivalent to understanding that agent and locus of Incarnation are necessarily distinct.
One might object to the last stretch of argumentation by claiming that it is a false alternative to suppose that either the Son incarnates himself in himself or incarnates himself in another. It might be said that in the Incarnation the Son assumes human nature without thereby identifying himself with a human individual. That is, in the Incarnation God the Son becomes man, but not a particular man. There is exactly one hypostasis and that is the Logos. This anhypostasia doctrine, as it is called, was first set forth by Cyril of Alexandria (376-444) in controversy with Nestorius. Nestorius was accused of dividing Christ into two persons. According to D. M. Baillie,
Against this [Nestorian] position Cyril worked out the idea, which passed into Catholic dogma, that there was no man Jesus existing independently of the Divine Logos: the human element in the Incarnation was simply human nature assumed by the Second Person of the Trinity. Thus there was no human hypostasis or persona: the persona was the Divine Son, while the human nature was anhypostatos — ‘impersonal humanity.’[16]
But if the Word became flesh and dwelt among us, this can only mean that the Word became an individual concrete human being, and not a human being in the abstract. Surely nothing can become man without becoming a man. God can become man only by becoming a particular man. So the point stands: God the Son incarnates himself in, and as, another.
Indeed, this must be the doctrine if it is to avoid both Docetism and Appolinarianism. For if the Logos becomes man without becoming a man complete with a human personality, then either he is only apparently, but [Philo 92] not really, a man (Docetism), or he is a divine being in a human body (Appolinarianism).
Further Modalized Discernibility Objections
It is clear that modalized discernibility objections are easily generated. Here is a second example. The explanation and defense of this argument is the same mutatis mutandis as for the argument from (6) and (7) to (8).
9. The Son has the property of divinity-in-all-worlds.
10. Jesus does not have the property of divinity-in-all-worlds (because Jesus does not exist in all worlds).
Therefore
11. The Son and Jesus are not the same individual.
Finally, it appears that the Morris strategy lacks the resources to defuse this very simple and very compelling argument:
12. If a is identical with b, then necessarily, a is identical with b.
Therefore
13. If it is possible that a is distinct from b, then a is distinct from b.
14. It is possible that God the Son is distinct from Jesus.
Therefore
15. God the Son is distinct from (is not identical with) Jesus.
This argument is plainly valid in point of logical form: (13) follows from (12) by Contraposition, and (15) follows from (13) and (14) by Modus Ponens and Universal Instantiation. Is it sound? Well, (14) is a commitment of orthodoxy: if God the Son is contingently human, then there are possible worlds in which he is distinct from every human being, and therefore distinct from Jesus, which amounts to (14). So it all comes down to (12), the principle of the necessity of identity. This is but a consequence of the Indiscernibility of Identicals,[17] so (12) is true and the argument is sound.
To defeat this argument, the proponent of OCI must reject (14); but he cannot do so consistently with other things he must hold. For to reject (14) would be to accept its negation, Necessarily, God the Son is identical with Jesus. But given that the Incarnation is a contingent event, the 'identity' of God the Son and Jesus must also be contingent, which implies the falsity of Necessarily, God the Son is identical with Jesus.
This may also be seen in terms of our earlier distinction between the agent and locus of Incarnation. Necessarily, God the Son is identical with Jesus implies that agent and locus are the same individual. Given that the agent is a necessary being, it follows that the locus is as well. But this implies that the Incarnation occurs in every possible world — in contradiction to orthodoxy's commitment to the contingency of the Incarnation. [Philo 93]
Endnotes
[1]. Thus the property of being accidentally human is not included in (entailed by) human nature, since if x instantiates human nature, it does not follow that x is accidentally human.
[2]. An example of an intentional property is that of being believed by George W. Bush to be a philosopher. Jesus has this property, but I take it that the Logos does not. But discernibility in respect of this property surely does not show that Jesus and the Logos are two and not one.
[3]. Cf. Harry Austryn Wolfson, The Philosophy of the Church Fathers, vol. I (Cambridge: Harvard University Press, 1956), pp. 433-444. Some sources show the variant spelling, 'Apollinarius.'
[4]. C. S. Lewis, Miracles: A Preliminary Study (New York: Macmillan Publishing Co., 1978), p. 110.
[5]. I mention this only because a professor of philosophy once tried to convince me of the possibility of the Incarnation using just this hopeless analogy.
[6]. Thomas V. Morris, The Logic of God Incarnate (Ithaca: Cornell University Press, 1986), p. 62 ff. Cited hereafter as ‘LGI.’
[7]. LGI, p. 65.
[8]. Property P entails property Q just in case there is no metaphysically possible world in which P is exemplified and Q is not exemplified.
[9]. LGI, p. 66.
[10]. Among these I would count being an animal and being a material thing.
[11]. LGI, p. 65.
[12]. T. V. Morris, "The Metaphysics of God Incarnate," in Trinity, Incarnation and Atonement: Philosophical and Theological Essays eds. Ronald J. Feenstra and Cornelius Plantinga, Jr. (University of Notre Dame Press, 1989), p. 117. Cited hereafter as ‘MGI.’
[13]. MGI, 118.
[14]. MGI, 118
[15]. Morris may be presupposing the anhypostasia doctrine discussed below in section 5.
[16]. D. M. Baillie, God was in Christ: An Essay on Incarnation and Atonement (London: Faber and Faber, Limited, 1956), p. 86.
[17]. See Saul Kripke, "Identity and Necessity" in Identity and Individuation, ed. Milton K. Munitz (New York: New York University Press, 1971), p. 136.