40 But these words of the Lord are not new, or attested now for the first time in the teaching of the Gospels, for He testified to this very mystery of God the Father glorifying the Son with Himself by the noble joy at the fulfilment of His hope, with which He rejoiced at the very moment when Judas went forth to betray Him. Filled with joy that His purpose was now to be fully accomplished, He said, Now is the Son of Man glorified and God is glorified in Him. If God is glorified in Him, He has glorified Him in Himself, and straightway has He glorified Him. How can we whose souls are burdened with bodies of clay, whose minds are polluted and stained with foul consciousness of sin, be so puffed up as to judge of His divine claim?
How can we set up ourselves to criticise His heavenly nature, rebelling against God with our unhallowed and blasphemous disputations? The Lord enunciated the faith of the Gospel in the simplest words that could be found, and fitted His discourses to our understanding, so far as the weakness of our nature allowed Him, without saying anything unworthy of the majesty of His own nature. The signification of His opening words cannot, I think, be doubted, Now is the Son of Man glorified; that is, all the glory which He obtains is not for the Word but for His flesh: not for the birth of His Godhead, but for the dispensation of His manhood born into the world.
What then, may I ask, is the meaning of what follows, And God is glorified in Him? I hear that God is glorified in Him; but what that can be according to your interpretation, heretic, I do not know. God is glorified in Him, in the Son of Man, that is: tell me, then, is the Son of Man the same as the Son of God? And since the Son of Man is not one and the Son of God another, but He Who is Son of God is Himself also Son of Man, Who, pray, is the God Who is glorified in this Son of Man, Who is also Son of God?
Source: On the Trinity (New Advent)