He hath blinded, &c. Quoted from Isaiah 6:9; Isaiah 6:10. See notes there. This was the second occasion of this prophecy being quoted, the first being in Matthew 18:14 (compare Mark 4:12.Luke 8:10; Luke 8:10), when the Lord explained why He spoke to the people in parables; the other two being Acts 28:26; Acts 28:27 and Romans 11:8.
Related Commentaries of John 12:40
John 12:40
40 He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.