John 8:27
They did not understand that he had been speaking to them about the Father.
Isaiah 6:9
And he said, "Go, and say to this people: "'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'
Isaiah 42:18-20
Hear, you deaf, and look, you blind, that you may see!
Isaiah 59:10
We grope for the wall like the blind; we grope like those who have no eyes; we stumble at noon as in the twilight, among those in full vigor we are like dead men.
John 8:43
Why do you not understand what I say? It is because you cannot bear to hear my word.
John 8:47
Whoever is of God hears the words of God. The reason why you do not hear them is that you are not of God."
Romans 11:7-10
What then? Israel failed to obtain what it was seeking. The elect obtained it, but the rest were hardened,
2 Corinthians 4:3-4
And even if our gospel is veiled, it is veiled only to those who are perishing.