Thomas Aquinas - Summa Theologica, Part III (Tertia Pars)

Reply Obj. 2: As Pope Leo says in the same Epistle, Christ's soul excels our soul "not by diversity of genus, but by sublimity of power"; for it is of the same genus as our souls, yet excels even the angels in "fulness of grace and truth." But the mode of creation is in harmony with the generic property of the soul; and since it is the form of the body, it is consequently created at the same time that it is infused into and united with the body; which does not happen to angels, since they are substances entirely free from matter.

Reply Obj. 3: Of the fulness of Christ all men receive according to the faith they have in Him; for it is written (Rom. 3:22) that "the justice of God is by faith of Jesus Christ unto all and upon all them that believe in Him." Now just as we believe in Him as already born; so the ancients believed in Him as about to be born, since "having the same spirit of faith . . . we also believe," as it is written (2 Cor. 4:13). But the faith which is in Christ has the power of justifying by reason of the purpose of the grace of God, according to Rom. 4:5: "But to him that worketh not, yet believeth in Him that justifieth the ungodly, his faith is reputed to justice according to the purpose of the grace of God." Hence because this purpose is eternal, there is nothing to hinder some from being justified by the faith of Jesus Christ, even before His soul was full of grace and truth. _______________________

FOURTH ARTICLE [III, Q. 6, Art. 4]

Whether the Flesh of Christ Was Assumed by the Word Before Being

United to the Soul?

Objection 1: It would seem that the flesh of Christ was assumed by the Word before being united to the soul. For Augustine [*Fulgentius] says (De Fide ad Petrum xviii): "Most firmly hold, and nowise doubt that the flesh of Christ was not conceived in the womb of the Virgin without the Godhead before it was assumed by the Word." But the flesh of Christ would seem to have been conceived before being united to the rational soul, because matter or disposition is prior to the completive form in order of generation. Therefore the flesh of Christ was assumed before being united to the soul.

Obj. 2: Further, as the soul is a part of human nature, so is the body. But the human soul in Christ had no other principle of being than in other men, as is clear from the authority of Pope Leo, quoted above (A. 3). Therefore it would seem that the body of Christ had no other principle of being than we have. But in us the body is begotten before the rational soul comes to it. Therefore it was the same in Christ; and thus the flesh was assumed by the Word before being united to the soul.

Obj. 3: Further, as is said (De Causis), the first cause excels the second in bringing about the effect, and precedes it in its union with the effect. But the soul of Christ is compared to the Word as a second cause to a first. Hence the Word was united to the flesh before it was to the soul.

On the contrary, Damascene says (De Fide Orth. iii, 2): "At the same time the Word of God was made flesh, and flesh was united to a rational and intellectual soul." Therefore the union of the Word with the flesh did not precede the union with the soul.

I answer that, The human flesh is assumable by the Word on account of the order which it has to the rational soul as to its proper form. Now it has not this order before the rational soul comes to it, because when any matter becomes proper to any form, at the same time it receives that form; hence the alteration is terminated at the same instant in which the substantial form is introduced. And hence it is that the flesh ought not to have been assumed before it was human flesh; and this happened when the rational soul came to it. Therefore since the soul was not assumed before the flesh, inasmuch as it is against the nature of the soul to be before it is united to the body, so likewise the flesh ought not to have been assumed before the soul, since it is not human flesh before it has a rational soul.

Reply Obj. 1: Human flesh depends upon the soul for its being; and hence, before the coming of the soul, there is no human flesh, but there may be a disposition towards human flesh. Yet in the conception of Christ, the Holy Ghost, Who is an agent of infinite might, disposed the matter and brought it to its perfection at the same time.

Reply Obj. 2: The form actually gives the species; but the matter in itself is in potentiality to the species. And hence it would be against the nature of a form to exist before the specific nature. And therefore the dissimilarity between our origin and Christ's origin, inasmuch as we are conceived before being animated, and Christ's flesh is not, is by reason of what precedes the perfection of the nature, viz. that we are conceived from the seed of man, and Christ is not. But a difference which would be with reference to the origin of the soul, would bespeak a diversity of nature.

Reply Obj. 3: The Word of God is understood to be united to the flesh before the soul by the common mode whereby He is in the rest of creatures by essence, power, and presence. Yet I say "before," not in time, but in nature; for the flesh is understood as a being, which it has from the Word, before it is understood as animated, which it has from the soul. But by the personal union we understand the flesh as united to the soul before it is united to the Word, for it is from its union with the soul that it is capable of being united to the Word in Person; especially since a person is found only in the rational nature. _______________________

FIFTH ARTICLE [III, Q. 6, Art. 5]

Whether the Whole Human Nature Was Assumed Through the Medium of the

Parts?

Objection 1: It would seem that the Son of God assumed the whole human nature through the medium of its parts. For Augustine says (De Agone Christ. xviii) that "the invisible and unchangeable Truth assumed the soul through the medium of the spirit, and the body through the medium of the soul, and in this way the whole man." But the spirit, soul, and body are parts of the whole man. Therefore He assumed all, through the medium of the parts.

Obj. 2: Further, the Son of God assumed flesh through the medium of the soul because the soul is more like to God than the body. But the parts of human nature, since they are simpler than the body, would seem to be more like to God, Who is most simple, than the whole. Therefore He assumed the whole through the medium of the parts.

Obj. 3: Further, the whole results from the union of parts. But the union is taken to be the term of the assumption, and the parts are presupposed to the assumption. Therefore He assumed the whole by the parts.

On the contrary, Damascene says (De Fide Orth. iii, 16): "In our Lord Jesus Christ we do not behold parts of parts, but such as are immediately joined, i.e. the Godhead and the manhood." Now the humanity is a whole, which is composed of soul and body, as parts. Therefore the Son of God assumed the parts through the medium of the whole.

I answer that, When anything is said to be a medium in the assumption of the Incarnation, we do not signify order of time, because the assumption of the whole and the parts was simultaneous. For it has been shown (AA. 3, 4) that the soul and body were mutually united at the same time in order to constitute the human nature of the Word. But it is order of nature that is signified. Hence by what is prior in nature, that is assumed which is posterior in nature. Now a thing is prior in nature in two ways: First on the part of the agent, secondly on the part of the matter; for these two causes precede the thing. On the part of the agent—that is simply first, which is first included in his intention; but that is relatively first, with which his operation begins—and this because the intention is prior to the operation. On the part of the matter—that is first which exists first in the transmutation of the matter. Now in the Incarnation the order depending on the agent must be particularly considered, because, as Augustine says (Ep. ad Volusianum cxxxvii), "in such things the whole reason of the deed is the power of the doer." But it is manifest that, according to the intention of the doer, what is complete is prior to what is incomplete, and, consequently, the whole to the parts. Hence it must be said that the Word of God assumed the parts of human nature, through the medium of the whole; for even as He assumed the body on account of its relation to the rational soul, so likewise He assumed a body and soul on account of their relation to human nature.