Matthew 13:51
Have you understood all this?" They said to him, "Yes."
Matthew 15:16-17
He said, "And are you totally ignorant?
Matthew 16:11
Why do you not see that I was not speaking to you about bread? No, beware of the leaven of the Pharisees and Sadducees."
Mark 4:13
And he said to them, "You do not understand this parable? Then how are you to understand the other parables?
Luke 9:45
But they did not understand this saying ??indeed it was kept a secret from them, to prevent them from fathoming it ??and they were afraid to ask him about this saying.
Acts 8:30
When Philip ran up, he heard him reading the prophet Isaiah. "Do you really understand what you are reading?"