But this was to fulfill the word of Isaiah the prophet, who said: Lord, who has believed our message? And who has the arm of the Lord been revealed to?
References for John 12:38
This is why they were unable to believe, because Isaiah also said:
He has blinded their eyes and hardened their hearts, so that they would not see with their eyes or understand with their hearts, and be converted, and I would heal them.
References for John 12:40
Isaiah said these things because he saw His glory and spoke about Him.
References for John 12:41