28 Then, when he was teaching in the Temple, Jesus said with a loud voice, You have knowledge of me and you have knowledge of where I come from; and I have not come of myself; but there is One who has sent me; he is true, but you have no knowledge of him.
Matthew Henry's Commentary on John 7:28
Commentary on John 7:25-30
(Read John 7:25-30)
Christ proclaimed aloud, that they were in error in their thoughts about his origin. He was sent of God, who showed himself true to his promises. This declaration, that they knew not God, with his claim to peculiar knowledge, provoked the hearers; and they sought to take him, but God can tie men's hands, though he does not turn their hearts.