Objection 2: Further, it belongs to the same person to ascend into heaven as to descend from heaven, according to Jn. 3:13 : "No man hath ascended into heaven, but He that descended from heaven": and Eph. 4:10 : "He that descended is the same also that ascended." But Christ came down from heaven not as man, but as God: because previously His Nature in heaven was not human, but Divine. Therefore it seems that Christ ascended into heaven as God.
Objection 3: Further, by His Ascension Christ ascended to the Father. But it was not as man that He rose to equality with the Father; for in this respect He says: "He is greater than I," as is said in Jn. 14:28. Therefore it seems that Christ ascended as God.
On the contrary, on Eph. 4:10 : "That He ascended, what is it, but because He also descended," a gloss says: "It is clear that He descended and ascended according to His humanity."
I answer that, The expression "according to" can denote two things; the condition of the one who ascends, and the cause of his ascension. When taken to express the condition of the one ascending, the Ascension in no wise belongs to Christ according to the condition of His Divine Nature; both because there is nothing higher than the Divine Nature to which He can ascend; and because ascension is local motion, a thing not in keeping with the Divine Nature, which is immovable and outside all place. Yet the Ascension is in keeping with Christ according to His human nature, which is limited by place, and can be the subject of motion. In this sense, then, we can say that Christ ascended into heaven as man, but not as God.
But if the phrase "according to" denote the cause of the Ascension, since Christ ascended into heaven in virtue of His Godhead, and not in virtue of His human nature, then it must be said that Christ ascended into heaven not as man, but as God. Hence Augustine says in a sermon on the Ascension: "It was our doing that the Son of man hung upon the cross; but it was His own doing that He ascended."
Reply to Objection 1: These utterances were spoken prophetically of God who was one day to become incarnate. Still it can be said that although to ascend does not belong to the Divine Nature properly, yet it can metaphorically; as, for instance, it is said "to ascend in the heart of man" (cf. Ps. 83:6 ), when his heart submits and humbles itself before God: and in the same way God is said to ascend metaphorically with regard to every creature, since He subjects it to Himself.
Reply to Objection 2: He who ascended is the same as He who descended. For Augustine says (De Symb. iv): "Who is it that descends? The God-Man. Who is it that ascends? The self-same God-Man." Nevertheless a twofold descent is attributed to Christ; one, whereby He is said to have descended from heaven, which is attributed to the God-Man according as He is God: for He is not to be understood as having descended by any local movement, but as having "emptied Himself," since "when He was in the form of God He took the form of a servant." For just as He is said to be emptied, not by losing His fulness, but because He took our littleness upon Himself, so likewise He is said to have descended from heaven, not that He deserted heaven, but because He assumed human nature in unity of person.
And there is another descent whereby He descended "into the lower regions of the earth," as is written Eph. 4:9 ; and this is local descent: hence this belongs to Christ according to the condition of human nature.
Reply to Objection 3: Christ is said to ascend to the Father, inasmuch as He ascends to sit on the right hand of the Father; and this is befitting Christ in a measure according to His Divine Nature, and in a measure according to His human nature, as will be said later (Q[58], A[3])
Whether Christ ascended by His own power?
Objection 1: It would seem that Christ did not ascend by His own power, because it is written ( Mk. 16:19 ) that "the Lord Jesus, after He had spoken to them, was taken up to heaven"; and ( Acts 1:9 ) that, "while they looked on, He was raised up, and a cloud received Him out of their sight." But what is taken up, and lifted up, appears to be moved by another. Consequently, it was not by His own power, but by another's that Christ was taken up into heaven.
Objection 2: Further, Christ's was an earthly body, like to ours. But it is contrary to the nature of an earthly body to be borne upwards. Moreover, what is moved contrary to its nature is nowise moved by its own power. Therefore Christ did not ascend to heaven by His own power.
Objection 3: Further, Christ's own power is Divine. But this motion does not seem to have been Divine, because, whereas the Divine power is infinite, such motion would be instantaneous; consequently, He would not have been uplifted to heaven "while" the disciples "looked on," as is stated in Acts 1:9. Therefore, it seems that Christ did not ascend to heaven by His own power.
On the contrary, It is written ( Is. 63:1 ): "This beautiful one in his robe, walking in the greatness of his strength." Also Gregory says in a Homily on the Ascension (xxix): "It is to be noted that we read of Elias having ascended in a chariot, that it might be shown that one who was mere man needed another's help. But we do not read of our Saviour being lifted up either in a chariot or by angels, because He who had made all things was taken up above all things by His own power."
I answer that, There is a twofold nature in Christ, to wit, the Divine and the human. Hence His own power can be accepted according to both. Likewise a twofold power can be accepted regarding His human nature: one is natural, flowing from the principles of nature; and it is quite evident that Christ did not ascend into heaven by such power as this. The other is the power of glory, which is in Christ's human nature; and it was according to this that He ascended to heaven.
Now there are some who endeavor to assign the cause of this power to the nature of the fifth essence. This, as they say, is light, which they make out to be of the composition of the human body, and by which they contend that contrary elements are reconciled; so that in the state of this mortality, elemental nature is predominant in human bodies: so that, according to the nature of this predominating element the human body is borne downwards by its own power: but in the condition of glory the heavenly nature will predominate, by whose tendency and power Christ's body and the bodies of the saints are lifted up to heaven. But we have already treated of this opinion in the FP, Q[76], A[7], and shall deal with it more fully in treating of the general resurrection (XP, Q[84], A[1]).
Setting this opinion aside, others assign as the cause of this power the glorified soul itself, from whose overflow the body will be glorified, as Augustine writes to Dioscorus (Ep. cxviii). For the glorified body will be so submissive to the glorified soul, that, as Augustine says (De Civ. Dei xxii), "wheresoever the spirit listeth, thither the body will be on the instant; nor will the spirit desire anything unbecoming to the soul or the body." Now it is befitting the glorified and immortal body for it to be in a heavenly place, as stated above (A[1]). Consequently, Christ's body ascended into heaven by the power of His soul willing it. But as the body is made glorious by participation with the soul, even so, as Augustine says (Tract. xxiii in Joan.), "the soul is beatified by participating in God." Consequently, the Divine power is the first source of the ascent into heaven. Therefore Christ ascended into heaven by His own power, first of all by His Divine power, and secondly by the power of His glorified soul moving His body at will.
Reply to Objection 1: As Christ is said to have risen by His own power, though He was raised to life by the power of the Father, since the Father's power is the same as the Son's; so also Christ ascended into heaven by His own power, and yet was raised up and taken up to heaven by the Father.
Reply to Objection 2: This argument proves that Christ did not ascend into heaven by His own power, i.e. that which is natural to human nature: yet He did ascend by His own power, i.e. His Divine power, as well as by His own power, i.e. the power of His beatified soul. And although to mount upwards is contrary to the nature of a human body in its present condition, in which the body is not entirely dominated by the soul, still it will not be unnatural or forced in a glorified body, whose entire nature is utterly under the control of the spirit.
Reply to Objection 3: Although the Divine power be infinite, and operate infinitely, so far as the worker is concerned, still the effect thereof is received in things according to their capacity, and as God disposes. Now a body is incapable of being moved locally in an instant, because it must be commensurate with space, according to the division of which time is reckoned, as is proved in Physics vi. Consequently, it is not necessary for a body moved by God to be moved instantaneously, but with such speed as God disposes.
Whether Christ ascended above all the heavens?
Objection 1: It would seem that Christ did not ascend above all the heavens, for it is written ( Ps. 10:5 ): "The Lord is in His holy temple, the Lord's throne is in heaven." But what is in heaven is not above heaven. Therefore Christ did not ascend above all the heavens.
Objection 2: [*This objection with its solution is omitted in the Leonine edition as not being in the original manuscript.]
Further, there is no place above the heavens, as is proved in De Coelo i. But every body must occupy a place. Therefore Christ's body did not ascend above all the heavens.
Objection 3: Further, two bodies cannot occupy the same place. Since, then, there is no passing from place to place except through the middle space, it seems that Christ could not have ascended above all the heavens unless heaven were divided; which is impossible.