NT-GOSPEL.filter - nkjv hardened:

nkjv@Mark:6:52 @ For they had not understood about the loaves, because their heart was hardened.

nkjv@Mark:8:17 @ But Jesus, being aware of it, said to them, "Why do you reason because you have no bread? Do you not yet perceive nor understand? Is your heart still hardened?

nkjv@John:12:40 @ "He has blinded their eyes and hardened their hearts, Lest they should see with their eyes, Lest they should understand with their hearts and turn, So that I should heal them."