Mark 8:21
And he said to them: How is it that you do not understand?
Mark 6:52
for they had learned nothing from the loaves: for their heart was hardened.
Matthew 16:11-12
How is it that you do not understand, that I did not speak of bread when I commanded you to beware of the leaven of the Pharisees and of the Sadducees?
Mark 8:12
And he sighed deeply in his spirit, and said: Why does this generation seek for a sign? Verily I say to you, No sign will be given to this generation.
Mark 8:17
And Jesus perceived it, and said to them: Why do you reason, because you have no bread? Do you not yet perceive, nor understand? Is your heart still hardened?
Mark 9:19
And he answered them, and said: faithless generation! how long shall I be with you? how long shall I bear with you? Bring him to me.
John 14:9
Jesus said to him: Have I been so long with you, and have you not known me, Philip? He that has seen me, has seen the Father; and how say you, Show us the Father?
1 Corinthians 6:5
I speak to your shame. Is it so, that there is not among you a wise man, not even one, who shall be able to arbitrate between his brethren?
1 Corinthians 15:34
Awake, as you should, to soberness, and sin not; for some have not the knowledge of God. I speak this to your shame.