Augustine of Hippo
Catena Aurea · Johannesevangelium 8
Then said the Jews unto him, Now we know that thou hast a devil. Abraham is dead, and the prophets; and thou sayest, If a man keep my saying, he shall never taste of death. Art thou greater than our father Abraham, which is dead? and the prophets are dead; whom makest thou thyself? Jesus answered, If I honour myself, my honour is nothing; it is my Father that honoureth me; of whom ye say, that he is your God: Yet ye have not known him; but I know him: and if I should say, I know him not, I shall be a liar like unto you: but I know him, and keep his saying. Your father Abraham rejoiced to see my day: and he saw it, and was glad.
(Tr. xliii. 15) Some heretics say that the God proclaimed in the Old Testament is not the Father of Christ, but a kind of prince of bad angels. These He contradicts when He calls Him His Father, whom the Jews called their God, and knew not. For had they known Him, they would have received His Son. Of Himself however He adds, But I know Him. And here too, to men judging after the flesh, He might appear arrogant. But let not arrogance be so guarded against, as that truth be deserted. Therefore our Lord says, And if I should say I know Him not, I should be a liar like unto you.