21 And he said to them, How is it that ye do not understand?
Mark 8:21 Cross References - Webster
Psalms 94:8
8 Understand, ye brutish among the people: and ye fools, when will ye be wise?
Matthew 16:11-12
11 How is it that ye do not understand that I spoke not to you concerning bread, that ye should beware of the leaven of the Pharisees and of the Sadducees?
12 Then they understood that he did not caution them against the leaven of bread, but against the doctrine of the Pharisees and of the Sadducees.
Mark 6:52
52 For they considered not the miracle of the loaves; for their heart was hardened.
Mark 8:12
12 And he sighed deeply in his spirit, and saith, Why doth this generation seek for a sign? Verily I say to you, There shall no sign be given to this generation.
Mark 8:17
17 And when Jesus knew it, he saith to them, Why reason ye, because ye have no bread? perceive ye not yet, neither understand? have ye your heart yet hardened?
Mark 9:19
19 He answered him, and saith, O faithless generation, how long shall I be with you, how long shall I suffer you? bring him to me.
John 14:9
9 Jesus saith to him, Have I been so long time with you, and yet hast thou not known me Philip? he that hath seen me, hath seen the Father; and how sayest thou then, Show us the Father?
1 Corinthians 6:5
5 I speak to your shame. Is it so, that there is not a wise man among you? no, not one that will be able to judge between his brethren?
1 Corinthians 15:34
34 Awake to righteousness, and sin not; for some have not the knowledge of God. I speak this to your shame.