Cross reference
John 12:39
39 For this cause they couldn't believe, for Isaiah said again,
John 5:44
44 How can you believe, who receive glory from one another, and you don't seek the glory that comes from the only God?
Isaiah 6:9-10
9 He said, "Go, and tell this people, 'You hear indeed, But don't understand; And you see indeed, But don't perceive.'
10 Make the heart of this people fat; Make their ears heavy, and shut their eyes; Lest they see with their eyes, And hear with their ears, And understand with their heart, And turn again, and be healed."
Isaiah 44:18-20
18 They don't know, neither do they consider: for he has shut their eyes, that they can't see; and their hearts, that they can't understand.
19 None calls to mind, neither is there knowledge nor understanding to say, I have burned part of it in the fire; yes, also I have baked bread on the coals of it; I have roasted flesh and eaten it: and shall I make the residue of it an abomination? shall I fall down to the stock of a tree?
20 He feeds on ashes; a deceived heart has turned him aside; and he can't deliver his soul, nor say, Is there not a lie in my right hand?
John 6:44
44 No one can come to me unless the Father who sent me draws him, and I will raise him up in the last day.
John 10:38
38 But if I do them, though you don't believe me, believe the works; that you may know and believe that the Father is in me, and I in the Father."
2 Peter 2:14
14 having eyes full of adultery, and who can't cease from sin; enticing unsettled souls; having a heart trained in greed; children of cursing;