John 12:38-40

Amplified Bible

³⁸ This 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)?”^{(A) 39} Therefore 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.”