John 8:54

"If I honor Myself, My honor is nothing." What say the heretics here? That He heard the question, "Art thou greater than our father Abraham?" and dared not to say to them, "Yea, I am greater," but did so in a covert manner. What then? Is His honor "nothing"? With respect to them it is nothing. And as He said, "My witness is not true," with reference to the opinion they would form of it, so also doth He speak here. "There is One that honoreth Me." And wherefore said He not, "The Father that sent Me," as He did before, but, "Of whom ye say that He is your God. Yet ye have not known Him." Because He desired to show that they not only knew not His Father, but that they knew not God.

(Tr. xliii. 14) This is to answer those who said, Whom makest Thou Thyself? He refers His glory to the Father, from Whom is: It is My Father that honoureth Me. The Arians take occasion from those words to calumniate our faith, and say, Lo, the Father is greater, for He glorifieth the Son. Heretics, have ye not read that the Son also glorifieth the Father?

"Jesus answered, If I glorify myself, my glory is nothing: it is my Father that glorifieth me." He said this on account of their saying, "Whom makest thou thyself?" For He refers His glory to the Father, of whom it is that He is God. From this expression also the Arians sometimes revile our faith, and say, See, the Father is greater; for at all events He glorifies the Son. Heretic, hast thou not read of the Son Himself also saying that He glorifies His Father? If both He glorifieth the Son, and the Son glorifieth the Father, lay aside thy stubbornness, acknowledge the equality, correct thy perversity.

The Father glorified the Son, at His baptism, on the mount, at the time of His passion, when a voice came to Him, in the midst of the crowd, when He raised Him up again after His passion, and placed Him at the right hand of His Majesty.

For had they known the Father really, they would have reverenced the Son. But they even despise God, who in the Law forbad murder, by their clamours against Christ. Wherefore He says, Ye have not known Him. Having that knowledge by nature; for as I am, so is the Father also; I know Myself, and therefore I know Him. And He gives the proof that He knows Him: And I keep His saying, i. e. His commandments. Some understand, I keep His saying, to mean, I keep the nature of His substance unchanged; for the substance of the Father and the Son is the same, as their nature is the same; and therefore I know the Father. And here has the force of because: I know Him because I keep His saying.