Mark 8:17-18
And Jesus knowing it said unto them, Why reason ye together, because ye have no loaves? Do ye not yet consider, nor understand? Have ye your heart yet hardened?
Luke 24:25
And he said unto them, O ye void of understanding, and slow of heart to believe all that the prophets have spoken!
John 3:19
Now this is the condemnation, that the light is come into the world, and men loved the darkness rather than the light, because their deeds were evil.
Matthew 13:14
And in them is fulfilled the prophecy of Isaiah, which saith, With the hearing ye shall hear, and not understand; and seeing ye shall see, and in no wise perceive: