John 12:35-40

35So Jesus said to them, "The light is among you for a little while longer. Walk while you have the light, lest darkness overtake you. The one who walks in the darkness does not know where he is going.

36While you have the light, believe in the light, that you may become sons of light." When Jesus had said these things, he departed and hid himself from them.

37Though he had done so many signs before them, they still did not believe in him,

38so 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?"

39Therefore they could not believe. For again Isaiah said,

40"He has blinded their eyes and hardened their heart, lest they see with their eyes, and understand with their heart, and turn, and I would heal them."