Augustine of Hippo — as excerpted in the Catena Aurea on John 7:25-30

“(Tr. xxxi. s. 2) This notion did not arise without foundation. We find indeed that the Scriptures said of Christ, He shall be called a Nazarene, (Matt. 2:23) and thus predicted whence He would come. And the Jews again told Herod, when he enquired, that Christ would be born in Bethlehem of Judah, and adduced the testimony of the Prophet. How then did this notion of the Jews arise, that, when Christ came, no one would know whence He was? From this reason, viz. that the Scriptures asserted both. As man, they foretold whence Christ would be; as God, He was hid from the profane, but revealed Himself to the godly. This notion they had taken from Isaiah, Who shall declare His generation? (Isa. 53) Our Lord replies, that they both knew Him, and knew Him not: Then cried Jesus in the temple as He taught, saying, Ye both know Me, and know whence I am: that is to say, Ye both know whence I am, and do not know whence I am: ye know whence I am, that I am Jesus of Nazareth, whose parents ye know. The birth from the Virgin was the only part of the matter unknown to them: with this exception, they knew all that pertained to Jesus as man. So He well says, Ye both know Me, and know whence I am: i. e. according to the flesh, and the likeness of man. But in respect of His divinity, He says, I am not come of Myself, but He that sent Me is true.”