John 8:43, 47
Why do you not understand what I am saying? It is because you are unable to accept My message. . . .

Isaiah 6:9
And He replied, "Go and tell this people: 'Be ever hearing, but never understanding; be ever seeing, but never perceiving.'

Isaiah 42:18-20
"Listen, you deaf, and look, you blind, that you may see. . . .

Isaiah 59:10
Like the blind, we feel our way along the wall, groping like those without eyes. We stumble at midday as in the twilight; among the vigorous we are like the dead.

Romans 11:7-10
What then? What Israel was seeking, it failed to obtain, but the elect did. The others were hardened, . . .

2 Corinthians 4:3, 4
And even if our gospel is veiled, it is veiled to those who are perishing. . . .