Matthew 13:51
Jesus said to them: Have you understood all these things? They said to him: Yes, Lord.
Matthew 15:16-17
Jesus replied: Are you also yet without understanding?
Matthew 16:11
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 4:13
And he said to them: Do you not understand this parable? And how then will you understand all parables?
Luke 9:45
But they did not understand this saying, and it was concealed from them, that they might not understand it; and they were afraid to ask him about this saying.
Acts 8:30
And Philip ran forward, and heard him reading the prophet Isaiah; and he said: Do you understand what you are reading?