Mark 4:12
so that 'seeing they may see but not perceive, and hearing may hear but not understand; lest they should turn again, and be forgiven.'"
Mark 8:17-21
Being aware of it, Jesus said to them, "Why do you discuss the fact that you have no bread? Do you not yet perceive or understand? Are your hearts hardened?
Ephesians 2:11
Therefore remember that formerly you, the Gentiles in the flesh, who are called "Uncircumcision" by the so-called "Circumcision," which is performed in the flesh by human hands
2 Thessalonians 2:10-12
and with all the deception of wickedness for those who are to perish, because they refused to love the truth and so be saved.