He healed my eyes and yet you don't know where he comes from? - John 9:30
The Jewish reglious leaders constantly opposed his and couldn't see past their own legalism and tradition long enough to see the miracle
The blind man and others understood who Jesus was because he witnessed the miracles with open minds and hearts
Jesus demonstarted God's power, the man did as Jesus said, and receive the gift of sight:
The Jewish leaders took issue to Jesus "working" on the Sabbath
Ex-blind man: If this man were not from God, he couldn't have done it - John 9:33
When we receive spiritual insight that changes our lives, we need to tell others what God has done - we were blind but now we see!