Mark 4:12; Mark 6:52; Mark 7:14; Mark 8:17; Mark 8:21

12 That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

52 For they considered not the miracle of the loaves: for their heart was hardened.

14 And when he had called all the people unto him, he said unto them,Hearken unto me every one of you, and understand:

17 And when Jesus knew it, he saith unto them,Why reason ye, because ye have no bread? perceive ye not yet, neither understand? have ye your heart yet hardened?

21 And he said unto them,How is it that ye do not understand?