John 12:37-41 NIV

[37] Even after Jesus had performed so many signs in their presence, they still would not believe in him. [38] This 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?” [39] For 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.” [41] Isaiah said this because he saw Jesus’ glory and spoke about him.