god has blinded their eyes and hardened their heart for they cannot turn to jesus and have jesus heal them.

Although jesus had performed numerous signs in their presence, they did not believe in him, so that the word spoken by the prophet Isaiah might be fulfilled: “Lord, who has believed what he heard from us, and to whom has the arm of the Lord been revealed?” For this reason they could not believe, for Isaiah said again, "God blinded them and made them close-minded so that their eyes don't see and their minds don't understand. And they never turn to me for healing!" Isaiah was referring to Jesus when he said this, because he saw the future and spoke of the Messiah's glory. Many rulers believed in Jesus. However, they wouldn't admit it publicly because the Pharisees would have thrown them out of the synagogue. For they loved the praise of men more than the praise of God. source from bible, John 12:37-43