Mark 8:21
"Do not you understand now?" he repeated.
Mark 6:52
For they had not understood about the loaves, their minds being slow to learn.
Matthew 16:11-12
How is it that you do not see that I was not speaking about bread? Be on your guard against the leaven of the Pharisees and Sadducees."
Mark 8:12
Sighing deeply, Jesus said: "Why does this generation ask for a sign? I tell you, no sign shall be given it."
Mark 8:17
And, noticing this, Jesus said to them: "Why are you talking about your being short of bread? Do not you yet see or understand? Are your minds still so slow or comprehension?
Mark 9:19
"O faithless generation!" exclaimed Jesus. "How long must I be with you? how long must I have patience with you? Bring the boy to me."
John 14:9
"Have I been all this time among you," said Jesus, "and yet you, Philip, have not recognized me? He who has seen me has seen the Father, how can you say, then, 'Show us the Father'?
1 Corinthians 6:5
Can it be that there is not one man among you wise enough to decide between two of his Brothers?
1 Corinthians 15:34
Awake to a righteous life, and cease to sin. There are some who have no true knowledge of God. I speak in this way to shame you.