Augustine of Hippo

(Tr. cv. 5) He had said above, Father, the hour is come; glorify Thy Son, that Thy Son also may glorify Thee: the order of which words shews that the Son was first to be glorified by the Father, that the Father might be glorified by the Son. But now He says, I have glorified Thee; and now glorify Me; as if He had first glorified the Father, and then asked to be glorified by Him. We must understand that the first is the order in which one was to succeed the other, but that He afterwards uses a past tense, to express a thing future; the meaning being, I will glorify Thee on the earth, by finishing the work Thou hast given Me to do: and now, Father, glorify Me, which is quite the same sentence with the first one, except that He adds here the mode in which He is to be glorified; with the glory which I had before the world was, with Thee. The order of the words is, The glory which I had with Thee before the world was. This has been taken by some to mean, that the human nature which was assumed by the Word, would be changed into the Word, that man would be changed into God, or, to speak more correctly, be lost in God. For no one would say that the Word of God would by that change be doubled, or even made at all greater. But we avoid this error, if we take the glory which He had with the Father before the world was, to be the glory which He predestined for Him on earth: (for if we believe Him to be the Son of man, we need not be afraid to say that He was predestinated.) This predestined time of His being glorified, He now saw was arrived, that He might now receive what had been aforetime predestined, He prayed accordingly: And now, Father, glorify Me, &c. i. e. that glory which I had with Thee by Thy predestination, it is now time that I should have at Thy right hand.