28 That provoked Jesus, who was teaching in the Temple, to cry out, "Yes, you think you know me and where I'm from, but that's not where I'm from. I didn't set myself up in business. My true origin is in the One who sent me, and you don't know him at all.
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.