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 Romans 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.