Reply Obj. 2: The flesh naturally seeks what is pleasing to it by the concupiscence of the sensitive appetite; but the flesh of man, who is a rational animal, seeks this after the manner and order of reason. And thus with the concupiscence of the sensitive appetite Christ's flesh naturally sought food, drink, and sleep, and all else that is sought in right reason, as is plain from Damascene (De Fide Orth. iii, 14). Yet it does not therefore follow that in Christ there was the fomes of sin, for this implies the lust after pleasurable things against the order of reason.
Reply Obj. 3: The spirit gives evidence of fortitude to some extent by resisting that concupiscence of the flesh which is opposed to it; yet a greater fortitude of spirit is shown, if by its strength the flesh is thoroughly overcome, so as to be incapable of lusting against the spirit. And hence this belonged to Christ, whose spirit reached the highest degree of fortitude. And although He suffered no internal assault on the part of the fomes of sin, He sustained an external assault on the part of the world and the devil, and won the crown of victory by overcoming them. _______________________
THIRD ARTICLE [III, Q. 15, Art. 3]
Whether in Christ There Was Ignorance?
Objection 1: It would seem that there was ignorance in Christ. For that is truly in Christ which belongs to Him in His human nature, although it does not belong to Him in His Divine Nature, as suffering and death. But ignorance belongs to Christ in His human nature; for Damascene says (De Fide Orth. iii, 21) that "He assumed an ignorant and enslaved nature." Therefore ignorance was truly in Christ.
Obj. 2: Further, one is said to be ignorant through defect of knowledge. Now some kind of knowledge was wanting to Christ, for the Apostle says (2 Cor. 5:21) "Him that knew no sin, for us He hath made sin." Therefore there was ignorance in Christ.
Obj. 3: Further, it is written (Isa. 8:4): "For before the child know to call his Father and his mother, the strength of Damascus . . . shall be taken away." Therefore in Christ there was ignorance of certain things.
On the contrary, Ignorance is not taken away by ignorance. But Christ came to take away our ignorance; for "He came to enlighten them that sit in darkness and in the shadow of death" (Luke 1:79). Therefore there was no ignorance in Christ.
I answer that, As there was the fulness of grace and virtue in Christ, so too there was the fulness of all knowledge, as is plain from what has been said above (Q. 7, A. 9; Q. 9). Now as the fulness of grace and virtue in Christ excluded the fomes of sin, so the fulness of knowledge excluded ignorance, which is opposed to knowledge. Hence, even as the fomes of sin was not in Christ, neither was there ignorance in Him.
Reply Obj. 1: The nature assumed by Christ may be viewed in two ways. First, in its specific nature, and thus Damascene calls it "ignorant and enslaved"; hence he adds: "For man's nature is a slave of Him" (i.e. God) "Who made it; and it has no knowledge of future things." Secondly, it may be considered with regard to what it has from its union with the Divine hypostasis, from which it has the fulness of knowledge and grace, according to John 1:14: "We saw Him [Vulg.: 'His glory'] as it were the Only-begotten of the Father, full of grace and truth"; and in this way the human nature in Christ was not affected with ignorance.