Matthew 13:51
Did ye understand all these things? They say to him, Yea.
Matthew 15:16-17
And he said, Are ye too still without discernment?
Matthew 16:11
How is it that ye do not understand, that I spoke not to you of loaves? But [I said] Beware of the leaven of the Pharisees and Sadducees.
Mark 4:13
And he saith to them, Know ye not this parable? and how will ye know all the parables?
Luke 9:45
But they knew not the meaning of these words, and it was hidden from them, that they might not perceive it; and they were afraid to ask him about these words.
Acts 8:30
And Philip ran up, and heard him reading Isaiah the prophet, and said, Well, but dost thou understand what thou art reading?