Of the Defects of Body Assumed by the Son of God

I answer that, It was fitting for the body assumed by the Son of God to be subject to human infirmities and defects; and especially for three reasons. First, because it was in order to satisfy for the sin of the human race that the Son of God, having taken flesh, came into the world. Now one satisfies for another's sin by taking on himself the punishment due to the sin of the other. But these bodily defects, to wit, death, hunger, thirst, and the like, are the punishment of sin, which was brought into the world by Adam, according to Rom. 5:12: "By one man sin entered into this world, and by sin death." Hence it was useful for the end of the Incarnation that He should assume these penalties in our flesh and in our stead, according to Isa. 53:4, "Surely He hath borne our infirmities." Secondly, in order to cause belief in the Incarnation. For since human nature is known to men only as it is subject to these defects, if the Son of God had assumed human nature without these defects, He would not have seemed to be true man, nor to have true, but imaginary, flesh, as the Manicheans held. And so, as is said, Phil. 2:7: "He . . . emptied Himself, taking the form of a servant, being made in the likeness of men, and in habit found as a man." Hence, Thomas, by the sight of His wounds, was recalled to the faith, as related John 20:26. Thirdly, in order to show us an example of patience by valiantly bearing up against human passibility and defects. Hence it is said (Heb. 12:3) that He "endured such opposition from sinners against Himself, that you be not wearied, fainting in your minds."

I answer that, Necessity is twofold. One is a necessity of constraint, brought about by an external agent; and this necessity is contrary to both nature and will, since these flow from an internal principle. The other is natural necessity, resulting from the natural principles—either the form (as it is necessary for fire to heat), or the matter (as it is necessary for a body composed of contraries to be dissolved). Hence, with this necessity, which results from the matter, Christ's body was subject to the necessity of death and other like defects, since, as was said (A. 1, ad 2), "it was by the consent of the Divine will that the flesh was allowed to do and suffer what belonged to it." And this necessity results from the principles of human nature, as was said above in this article. But if we speak of necessity of constraint, as repugnant to the bodily nature, thus again was Christ's body in its own natural condition subject to necessity in regard to the nail that pierced and the scourge that struck. Yet inasmuch as such necessity is repugnant to the will, it is clear that in Christ these defects were not of necessity as regards either the Divine will, or the human will of Christ considered absolutely, as following the deliberation of reason; but only as regards the natural movement of the will, inasmuch as it naturally shrinks from death and bodily hurt.

I answer that, In the verb "to contract" is understood the relation of effect to cause, i.e. that is said to be contracted which is derived of necessity together with its cause. Now the cause of death and such like defects in human nature is sin, since "by sin death entered into this world," according to Rom. 5:12. And hence they who incur these defects, as due to sin, are properly said to contract them. Now Christ had not these defects, as due to sin, since, as Augustine [Alcuin in the Gloss, Ord.], expounding John 3:31, "He that cometh from above, is above all," says: "Christ came from above, i.e. from the height of human nature, which it had before the fall of the first man." For He received human nature without sin, in the purity which it had in the state of innocence. In the same way He might have assumed human nature without defects. Thus it is clear that Christ did not contract these defects as if taking them upon Himself as due to sin, but by His own will.

I answer that, As stated above (AA. 1, 2), Christ assumed human defects in order to satisfy for the sin of human nature, and for this it was necessary for Him to have the fulness of knowledge and grace in His soul. Hence Christ ought to have assumed those defects which flow from the common sin of the whole nature, yet are not incompatible with the perfection of knowledge and grace. And thus it was not fitting for Him to assume all human defects or infirmities. For there are some defects that are incompatible with the perfection of knowledge and grace, as ignorance, a proneness towards evil, and a difficulty in well-doing. Some other defects do not flow from the whole of human nature in common on account of the sin of our first parent, but are caused in some men by certain particular causes, as leprosy, epilepsy, and the like; and these defects are sometimes brought about by the fault of the man, e.g. from inordinate eating; sometimes by a defect in the formative power. Now neither of these pertains to Christ, since His flesh was conceived of the Holy Ghost, Who has infinite wisdom and power, and cannot err or fail; and He Himself did nothing wrong in the order of His life. But there are some third defects, to be found amongst all men in common, by reason of the sin of our first parent, as death, hunger, thirst, and the like; and all these defects Christ assumed, which Damascene (De Fide Orth. i, 11; iii, 20) calls "natural and indetractible passions" —natural, as following all human nature in common; indetractible, as implying no defect of knowledge or grace.