Mark 8:21

8:21 Then he said to them, “Do you still not understand?”

Mark 6:52

6:52 because they did not understand about the loaves, but their hearts were hardened.

Mark 7:14

7:14 Then he called the crowd again and said to them, “Listen to me, everyone, and understand.

Mark 4:12

4:12 so that although they look they may look but not see,

and although they hear they may hear but not understand,

so they may not repent and be forgiven.”

Mark 8:17

8:17 When he learned of this, Jesus said to them, “Why are you arguing about having no bread? Do you still not see or understand? Have your hearts been hardened?