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

Obj. 3: Further, it has been said above (I, Q. 40, A. 3) that in the Godhead if the Personality is abstracted, nothing remains. But the one who assumes is something. Therefore, if the Personality is abstracted, the Divine Nature cannot assume.

On the contrary, In the Godhead Personality signifies a personal property; and this is threefold, viz. Paternity, Filiation and Procession, as was said above (I, Q. 30, A. 2). Now if we mentally abstract these, there still remains the omnipotence of God, by which the Incarnation was wrought, as the angel says (Luke 1:37): "No word shall be impossible with God." Therefore it seems that if the Personality be removed, the Divine Nature can still assume.

I answer that, The intellect stands in two ways towards God. First, to know God as He is, and in this manner it is impossible for the intellect to circumscribe something in God and leave the rest, for all that is in God is one, except the distinction of Persons; and as regards these, if one is removed the other is taken away, since they are distinguished by relations only which must be together at the same time. Secondly, the intellect stands towards God, not indeed as knowing God as He is, but in its own way, i.e. understanding manifoldly and separately what in God is one: and in this way our intellect can understand the Divine goodness and wisdom, and the like, which are called essential attributes, without understanding Paternity or Filiation, which are called Personalities. And hence if we abstract Personality by our intellect, we may still understand the Nature assuming.

Reply Obj. 1: Because in God what is, and whereby it is, are one, if any one of the things which are attributed to God in the abstract is considered in itself, abstracted from all else, it will still be something subsisting, and consequently a Person, since it is an intellectual nature. Hence just as we now say three Persons, on account of holding three personal properties, so likewise if we mentally exclude the personal properties there will still remain in our thought the Divine Nature as subsisting and as a Person. And in this way It may be understood to assume human nature by reason of Its subsistence or Personality.

Reply Obj. 2: Even if the personal properties of the three Persons are abstracted by our mind, nevertheless there will remain in our thoughts the one Personality of God, as the Jews consider. And the assumption can be terminated in It, as we now say it is terminated in the Person of the Word.

Reply Obj. 3: If we mentally abstract the Personality, it is said that nothing remains by way of resolution, i.e. as if the subject of the relation and the relation itself were distinct because all we can think of in God is considered as a subsisting suppositum. However, some of the things predicated of God can be understood without others, not by way of resolution, but by the way mentioned above. _______________________

FOURTH ARTICLE [III, Q. 3, Art. 4]

Whether One Person Without Another Can Assume a Created Nature?

Objection 1: It would seem that one Person cannot assume a created nature without another assuming it. For "the works of the Trinity are inseparable," as Augustine says (Enchiridion xxxviii). But as the three Persons have one essence, so likewise They have one operation. Now to assume is an operation. Therefore it cannot belong to one without belonging to another.

Obj. 2: Further, as we say the Person of the Son became incarnate, so also did the Nature; for "the whole Divine Nature became incarnate in one of Its hypostases," as Damascene says (De Fide Orth. iii, 6). But the Nature is common to the three Persons. Therefore the assumption is.

Obj. 3: Further, as the human nature in Christ is assumed by God, so likewise are men assumed by Him through grace, according to Rom. 14:3: "God hath taken him to Him." But this assumption pertains to all the Persons; therefore the first also.

On the contrary, Dionysius says (Div. Nom. ii) that the mystery of the Incarnation pertains to "discrete theology," i.e. according to which something "distinct" is said of the Divine Persons.

I answer that, As was said above (A. 1), assumption implies two things, viz. the act of assuming and the term of assumption. Now the act of assumption proceeds from the Divine power, which is common to the three Persons, but the term of the assumption is a Person, as stated above (A. 2). Hence what has to do with action in the assumption is common to the three Persons; but what pertains to the nature of term belongs to one Person in such a manner as not to belong to another; for the three Persons caused the human nature to be united to the one Person of the Son.

Reply Obj. 1: This reason regards the operation, and the conclusion would follow if it implied this operation only, without the term, which is a Person.

Reply Obj. 2: The Nature is said to be incarnate, and to assume by reason of the Person in Whom the union is terminated, as stated above (AA. 1, 2), and not as it is common to the three Persons. Now "the whole Divine Nature is" said to be "incarnate"; not that It is incarnate in all the Persons, but inasmuch as nothing is wanting to the perfection of the Divine Nature of the Person incarnate, as Damascene explains there.

Reply Obj. 3: The assumption which takes place by the grace of adoption is terminated in a certain participation of the Divine Nature, by an assimilation to Its goodness, according to 2 Pet. 1:4: "That you may be made partakers of the Divine Nature"; and hence this assumption is common to the three Persons, in regard to the principle and the term. But the assumption which is by the grace of union is common on the part of the principle, but not on the part of the term, as was said above. _______________________

FIFTH ARTICLE [III, Q. 3, Art. 5]

Whether Each of the Divine Persons Could Have Assumed Human Nature?

Objection 1: It would seem that no other Divine Person could have assumed human nature except the Person of the Son. For by this assumption it has been brought about that God is the Son of Man. But it was not becoming that either the Father or the Holy Ghost should be said to be a Son; for this would tend to the confusion of the Divine Persons. Therefore the Father and Holy Ghost could not have assumed flesh.

Obj. 2: Further, by the Divine Incarnation men have come into possession of the adoption of sons, according to Rom. 8:15: "For you have not received the spirit of bondage again in fear, but the spirit of adoption of sons." But sonship by adoption is a participated likeness of natural sonship which does not belong to the Father nor the Holy Ghost; hence it is said (Rom. 8:29): "For whom He foreknew He also predestinated to be made conformable to the image of His Son." Therefore it seems that no other Person except the Person of the Son could have become incarnate.

Obj. 3: Further, the Son is said to be sent and to be begotten by the temporal nativity, inasmuch as He became incarnate. But it does not belong to the Father to be sent, for He is innascible, as was said above (I, Q. 32, A. 3; First Part, Q. 43, A. 4). Therefore at least the Person of the Father cannot become incarnate.

On the contrary, Whatever the Son can do, so can the Father and the Holy Ghost, otherwise the power of the three Persons would not be one. But the Son was able to become incarnate. Therefore the Father and the Holy Ghost were able to become incarnate.

I answer that, As was said above (AA. 1, 2, 4), assumption implies two things, viz. the act of the one assuming and the term of the assumption. Now the principle of the act is the Divine power, and the term is a Person. But the Divine power is indifferently and commonly in all the Persons. Moreover, the nature of Personality is common to all the Persons, although the personal properties are different. Now whenever a power regards several things indifferently, it can terminate its action in any of them indifferently, as is plain in rational powers, which regard opposites, and can do either of them. Therefore the Divine power could have united human nature to the Person of the Father or of the Holy Ghost, as It united it to the Person of the Son. And hence we must say that the Father or the Holy Ghost could have assumed flesh even as the Son.