John Gill Commentary Isaiah 6:9

"And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not." — Isaiah 6:9 (ASV)

And he said, go, and tell this people What is and will be their case and condition, as follows:

hear you indeed; the words of the prophets sent to them, yea, Christ himself incarnate preaching among them; the great Prophet Moses said should be raised up to them:

but understand not; neither that he is the Messiah, nor the doctrines delivered by him; which were spoken to them in parables; see (Matthew 13:13–15):

and see you indeed; the miracles wrought by him, as raising the dead, cleansing the lepers, restoring sight to the blind, causing the deaf to hear, and the dumb to speak:

but perceive not; that he is the Messiah, though all the characteristics pointed at in prophecy are upon him, and such miracles are done by him.