John 12:37-41

37Even though He had done so many signs (attesting miracles) right before them, yet they still did not believe and failed to trust Him—

38This was to fulfill what Isaiah the prophet said: “Lord, who has believed our message? And to whom has the arm (the power) of the Lord been shown (unveiled, revealed)?”

39Therefore they could not believe, for Isaiah said again,

40“He has blinded their eyes and He hardened their heart, to keep them from seeing with their eyes and understanding with their heart and being converted; otherwise, I [their God] would heal them.”

41Isaiah said these things because he saw His glory and spoke about Him.