Reply Obj. 2: To Christ, inasmuch as He is the natural Son of God, is due an eternal inheritance, which is the uncreated beatitude through the uncreated act of knowledge and love of God, i.e. the same whereby the Father knows and loves Himself. Now the soul was not capable of this act, on account of the difference of natures. Hence it behooved it to attain to God by a created act of fruition which could not be without grace. Likewise, inasmuch as He was the Word of God, He had the power of doing all things well by the Divine operation. And because it is necessary to admit a human operation, distinct from the Divine operation, as will be shown (Q. 19, A. 1), it was necessary for Him to have habitual grace, whereby this operation might be perfect in Him.
Reply Obj. 3: The humanity of Christ is the instrument of the Godhead—not, indeed, an inanimate instrument, which nowise acts, but is merely acted upon; but an instrument animated by a rational soul, which is so acted upon as to act. And hence the nature of the action demanded that he should have habitual grace. _______________________
SECOND ARTICLE [III, Q. 7, Art. 2]
Whether in Christ There Were Virtues?
Objection 1: It would seem that in Christ there were no virtues. For Christ had the plenitude of grace. Now grace is sufficient for every good act, according to 2 Cor. 12:9: "My grace is sufficient for thee." Therefore there were no virtues in Christ.
Obj. 2: Further, according to the Philosopher (Ethic. vii, 1), virtue is contrasted with a "certain heroic or godlike habit" which is attributed to godlike men. But this belongs chiefly to Christ. Therefore Christ had not virtues, but something higher than virtue.
Obj. 3: Further, as was said above (I-II, Q. 65, AA. 1, 2), all the virtues are bound together. But it was not becoming for Christ to have all the virtues, as is clear in the case of liberality and magnificence, for these have to do with riches, which Christ spurned, according to Matt. 8:20: "The Son of man hath not where to lay His head." Temperance and continence also regard wicked desires, from which Christ was free. Therefore Christ had not the virtues.
On the contrary, on Ps. 1:2, "But His will is in the law of the Lord," a gloss says: "This refers to Christ, Who is full of all good." But a good quality of the mind is a virtue. Therefore Christ was full of all virtue.
I answer that, As was said above (I-II, Q. 110, AA. 3, 4), as grace regards the essence of the soul, so does virtue regard its power. Hence it is necessary that as the powers of the soul flow from its essence, so do the virtues flow from grace. Now the more perfect a principle is, the more it impresses its effects. Hence, since the grace of Christ was most perfect, there flowed from it, in consequence, the virtues which perfect the several powers of the soul for all the soul's acts; and thus Christ had all the virtues.
Reply Obj. 1: Grace suffices a man for all whereby he is ordained to beatitude; nevertheless, it effects some of these by itself—as to make him pleasing to God, and the like; and some others through the medium of the virtues which proceed from grace.