Mark 8:17-18
And Jesus knowing it saith unto them, What are ye reasoning about? because ye have no bread? Do ye not yet discern nor understand? have ye your heart still hardened?
Luke 24:25
And He said unto them, O people void of understanding and slow of heart to believe all that the prophets have spoken.
John 3:19
And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
Matthew 13:14
And in them is fulfilled the prophecy of Isaiah, which saith, Ye shall hear by the hearing of the ear, and not understand; and in seeing ye shall see, and not perceive: for the heart of this people is grown stupid,