If you saw a miracle, would you believe in Jesus? What if you saw 10 miracles, or 100 miracles? In John 12 verse 37 we read that many didn't believe even after seeing so many signs! But, then we find that Isaiah prophesied this about Jesus--that he would confirm the people's own decision to not believe. Jesus implores them in his last public teaching before the cross to listen to His Words, that they are from God, and that they are the words of eternal life.