On the contrary, It is written (Heb. 2:17) that "it behooved Him in all things to be made like unto His brethren," and especially as regards what belongs to the condition of human nature. But it belongs to the condition of human nature that the health of the body and its nourishment and growth are not subject to the bidding of reason or will, since natural things are subject to God alone Who is the author of nature. Therefore they were not subject in Christ. Therefore Christ's soul was not omnipotent with regard to His own body.
I answer that, As stated above (A. 2), Christ's soul may be viewed in two ways. First, in its proper nature and power; and in this way, as it was incapable of making exterior bodies swerve from the course and order of nature, so, too, was it incapable of changing its own body from its natural disposition, since the soul, of its own nature, has a determinate relation to its body. Secondly, Christ's soul may be viewed as an instrument united in person to God's Word; and thus every disposition of His own body was wholly subject to His power. Nevertheless, since the power of an action is not properly attributed to the instrument, but to the principal agent, this omnipotence is attributed to the Word of God rather than to Christ's soul.
Reply Obj. 1: This saying of Damascene refers to the Divine will of Christ, since, as he says in the preceding chapter (De Fide Orth. xix, 14, 15), it was by the consent of the Divine will that the flesh was allowed to suffer and do what was proper to it.
Reply Obj. 2: It was no part of the original justice which Adam had in the state of innocence that a man's soul should have the power of changing his own body to any form, but that it should keep it from any hurt. Yet Christ could have assumed even this power if He had wished. But since man has three states—viz. innocence, sin, and glory, even as from the state of glory He assumed comprehension and from the state of innocence, freedom from sin—so also from the state of sin did He assume the necessity of being under the penalties of this life, as will be said (Q. 14, A. 2).
Reply Obj. 3: If the imagination be strong, the body obeys naturally in some things, e.g. as regards falling from a beam set on high, since the imagination was formed to be a principle of local motion, as is said De Anima iii, 9, 10. So, too, as regards alteration in heat and cold, and their consequences; for the passions of the soul, wherewith the heart is moved, naturally follow the imagination, and thus by commotion of the spirits the whole body is altered. But the other corporeal dispositions which have no natural relation to the imagination are not transmuted by the imagination, however strong it is, e.g. the shape of the hand, or foot, or such like. _______________________
FOURTH ARTICLE [III, Q. 13, Art. 4]
Whether the Soul of Christ Had Omnipotence As Regards the Execution of His Will?
Objection 1: It would seem that the soul of Christ had not omnipotence as regards the execution of His own will. For it is written (Mk. 7:24) that "entering into a house, He would that no man should know it, and He could not be hid." Therefore He could not carry out the purpose of His will in all things.
Obj. 2: Further, a command is a sign of will, as was said in the First Part (Q. 19, A. 12). But our Lord commanded certain things to be done, and the contrary came to pass, for it is written (Matt. 9:30, 31) that Jesus strictly charged them whose eyes had been opened, saying: "See that no man know this. But they going out spread His fame abroad in all that country." Therefore He could not carry out the purpose of His will in everything.
Obj. 3: Further, a man does not ask from another for what he can do himself. But our Lord besought the Father, praying for what He wished to be done, for it is written (Luke 6:12): "He went out into a mountain to pray, and He passed the whole night in the prayer of God." Therefore He could not carry out the purpose of His will in all things.