Matthew 13:13-14
This is why I speak to them in parables, because for all their seeing they do not see and for all their hearing they do not hear or understand.
Mark 4:11-12
and he said to them: "The open secret of the Realm of God is granted to you, but these outsiders get everything by way of parables,
Luke 8:10
so he said, "It is granted you to understand the open secrets of the Reign of God, but the others get it in parables, so that for all their seeing they may not see, and for all their hearing they may not understand.
Acts 28:26
when he said, Go and tell this people, 'You will hear and hear but never understand, you will see and see but never perceive.'
2 Corinthians 3:14-15
Besides, their minds were dulled, for to this very day, when the Old Testament is read aloud, the same veil hangs. Veiled from them the fact that the glory fades in Christ!