John 12:36-41

36Believe in the light while you have the light, so that you may become children of light.” When he had finished speaking, Jesus left and hid himself from them.

37Even after Jesus had performed so many signs in their presence, they still would not believe in him.

38This was to fulfill the word of Isaiah the prophet: “Lord, who has believed our message and to whom has the arm of the Lord been revealed?”

39For this reason they could not believe, because, as Isaiah says elsewhere:

40“He has blinded their eyes and hardened their hearts, so they can neither see with their eyes, nor understand with their hearts, nor turn—and I would heal them.”

41Isaiah said this because he saw Jesus’ glory and spoke about him.