I am very impressed with Thomas Joseph White, OP, The Incarnate Lord: A Thomistic Study in Christology, The Catholic University of America Press, 2017, xiv + 534 pp. It deserves to be called magisterial, the work of a magister, a master. I am presently working through Chapter One, "The Ontology of the Hypostatic Union."
White and I are concerned with the intelligibility of the one person, two natures doctrine. (See yesterday's entry for background.) Fr. White of course considers the doctrine to be intelligible while I have my doubts. This entry presents one of the problems I am having.
Christ is one person in two distinct individual natures, the one divine, the other human. The one person is the Word (Logos), the Second Person of the Trinity. The Word is eternal, impassible, and necessary. In the patois of possible worlds, the Word exists in every metaphysically possible world. The hypostatic union is the union of the Word with the individual human nature (body and soul) of Jesus where the hypostasis or suppositum is the Word. It is that which has the nature or exists in the nature. White tells us that this union is not
. . . merely an accidental association of two beings, the man Jesus and the Word of God. Rather the Word subsists personally as man in a human nature. Consequently, Jesus's concrete body and soul are the subsistent body and soul of person of the Word. The person of Jesus simply is the person of the Son existing as man. (113)
We are being told that the person of Jesus is the eternal Word, the Son, not a human person. There is human nature in Jesus, but no human person in Jesus. So it not as if there are two persons, the person of the Word and the person of Jesus. There is only one person, the person of the Word. To think otherwise is the Nestorian heresy.
This raises the following question.
If the Word is a necessary being, and the union of the Word with human nature is not accidental, but essential, are we to conclude that the Word has a concrete human body and human soul in every possible world, and thus at every time? It would seem so. If x is united with N essentially, then x is united with N in every possible world in which x exists. So if x is a necessary being, then x is united with N in every possible world, period, which is to say that there is no possible world in which x is not united with N. Therefore,
1) If the Word is united to a human nature essentially, then there is no possible world in which the Word is not united to a human nature.
But then how is this consistent with the belief that the Incarnation was an historical event that occurred at a particular time and whose occurrence was contingent, not necessary? God became man to save man from the sin he incurred with Adam's fall, a fall that was itself contingent upon Adam's free choice to violate the divine command. That is,
2) There are possible worlds in which God does not create at all, and possible worlds in which God creates humans but there is no Fall, no need for Redemption, and thus no need for Incarnation.
Therefore
3) There are possible worlds in which the Word is not united to a human nature.
Therefore
4) It is not the case that the Word is united to a human nature essentially. (From 1, 3 by modus tollens)
Therefore
5) The Word is united to a human nature accidentally.
But this is contrary to the orthodox view at least as explained by Fr. White who draws upon Thomas. White tells us that "the humanity of Jesus is united to the Word as an intrinsic, 'conjoined instrument.' The being of the man Jesus is the being of the Word." (83) We are also told that the unity is "substantial not accidental." (83)
Why does Aquinas think that the Word must be united to the humanity of Jesus intrinsicaly and essentially as opposed to extrinsically and accidentally? Because he thinks that this is the only way to avoid the Nestorian heresy according to which there are two persons, the person of the Word and the person of Jesus.
The reasoning seems to go like this. In an ordinary man, body and soul form a substantial unity. If in Jesus body and soul formed a substantial unity, then Jesus would be a different substance and a different suppositum (hypostasis) from the Word, and Nestorianism would be the upshot. To avoid this, the proposal was made that body and soul in Christ do not form a substantial unity as they do in ordinary human beings. Thus on the so-called habitus theory, the third theory of the hypostatic union mentioned in Peter Lombard's Sentences, ". . . both the body and the soul are said to accrue to the person of the Word 'accidentally' as qualities or properties of the Word, but without subsistence in the Word." (85) This implies that body and soul are accidental to each other, which of course is unacceptable given the background Aristotelian commitments of Thomas.
So while the habitus theory aims to be anti-Nestorian, it ends up in an implicit Nestorianism according to White's Aquinas. You've got the Word and over against it the body of Jesus and the soul of Jesus as an accidental, not a substantial, unity. On this scheme the individual humanity (body and soul) of Jesus is accidental to the Word.
My point is that, on the one hand, this is how it should be given the contingency of the Fall and the contingency of the Incarnation. The Word is not essentially incarnated; it is accidentally incarnated. The humanity of the Word is accidental, not essential. That would seem to fit nicely with the Christian narrative. But on the other hand, if it is not the substance of the Son who dies on the cross, if it is not God himself who enters history and dies on the cross, if it is a man who is only accidentally and for a time united with the Word, then the debt that only God himslef can pay has not been paid in full.
So I think we can understand why the one person, two natures doctrine was deemed orthodox. But if I am right in my reasoning above, the orthodox doctrine entails the absurdity that the Word has a "concrete body and soul" (113) at every time and in every possible world.
To put it another way, the Incarnation makes no sense unless it is a contingent event, but it cannot be on the radically anti-Nestorian view of White's Aquinas.
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