John 17:2

(iii. de Trin) For being made flesh Himself, He was about to restore eternal life to frail, corporeal, and mortal man. (ix. de Trin. 31) If Christ be God, not begotten, but unbegotten, then let this receiving be thought weakness. But not if His receiving of power signifies His begetting, in which He received what He is. This gift cannot be counted for weakness. For the Father is such in that He gives; the Son remains God in that He hath received the power of giving eternal life.

"As Thou hast given Him power over all flesh." He now showeth, that what belongs to the preaching is not confined to the Jews alone, but is extended to all the world, and layeth down beforehand the first invitations to the Gentiles. And since He had said, "Go not into the way of the Gentiles" (Matt. x. 5), and after this time is about to say, "Go ye, and make disciples of all nations" (Matt. xxviii. 19), He showeth that the Father also willeth this. For this greatly offended the Jews, and the disciples too; nor indeed after this did they easily endure to lay hold on the Gentiles, until they received the teaching of the Spirit; because hence arose no small stumblingblock for the Jews.

"Of all flesh"? For certainly not all believed. Yet, for His part, all believed; and if men gave no heed to His words, the fault was not in the Teacher, but in those who received them not.

"That He should give eternal life to as many as Thou hast given Him." If here also He speaketh in a more human manner, wonder not. For He doth so both on account of the reasons I have given, and to avoid the saying anything great concerning Himself; since this was a stumblingblock to the hearers because as yet they imagined nothing great concerning Him.

(Tr. cv) But it is justly asked, how the Son can glorify the Father, when the eternal glory of the Father never experienced abasement in the form of man, and in respect of its own Divine perfection, does not admit of being added to. But among men this glory was less when God was only known in Judæa; and therefore the Son glorified the Father, when the Gospel of Christ spread the knowledge of the Father among the Gentiles. Glorify Thy Son, that Thy Son also may glorify Thee; i. e. Raise Me from the dead, that by Me Thou mayest be known to the whole world. Then He unfolds further the manner in which the Son glorifies the Father; As Thou hast given Him power over all flesh, that He should give eternal life to as many as Thou hast given Him. All flesh signifies all mankind, the part being put for the whole. And this power which is given to Christ by the Father over all flesh, must be understood with reference to His human nature. (Tr. cv. 2) He saith, As Thou hast given Him power over all flesh, so the Son may glorify Thee, i. e. make Thee known to all flesh which Thou hast given Him; for Thou hast so given it to Him, that He should give eternal life to as many as Thou hast given Him.