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 First Part (Q. 76, A. 7), and shall deal with it more fully in
treating of the general resurrection (Suppl., 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 Obj. 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 Obj. 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 Obj. 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