Mark 4:12
that they may surely see, and not perceive; and that they may surely hear, and not understand; lest they should turn to me, and their sins should be forgiven them.
Mark 8:17-21
And Jesus perceived it, and said to them: Why do you reason, because you have no bread? Do you not yet perceive, nor understand? Is your heart still hardened?
Ephesians 2:11
For which reason, remember that you were formerly Gen tiles, by natural descent, and that you are called Uncircumcision by the Circumcision; so called, from a mark made in the flesh by hands;
2 Thessalonians 2:10-12
and with all the delusion of unrighteousness in those who perish, because they did not receive the love of the truth, in order that they might be saved.