Mark 7:18

And he said to them: Are you also so void of understanding? Do you not perceive that nothing from without, by entering into a man, can defile him?

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 24:25

And he said to them: inconsiderate, and slow of heart to believe all things that the prophets have spoken!

John 3:10

Jesus answered and said to him: Are you the teacher of Israel, and do not understand these things?

1 Corinthians 3:2

I fed you with milk, not with meat; for you were not then able to bear it; indeed, not even now are you able;

Hebrews 5:11

Of him we have many things to say, and difficult to be explained, if we do say them, since you are slow in understanding.

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