Mark 7:18
"What, do even you understand so little?" exclaimed Jesus. "Do not you see that there is nothing external to a man, which by going into a man, can 'defile' him,
Matthew 15:16-17
"What, do even you understand nothing yet?" Jesus exclaimed.
Matthew 16:11
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 4:13
You do not know the meaning of this parable!" he went on; "Then how will you understand all the other parables?
Luke 24:25
Then Jesus said to them: "O foolish men, slow to accept all that the Prophets have said!
John 3:10
"What! You a teacher of Israel," exclaimed Jesus, "and yet do not understand this!
1 Corinthians 3:2
I fed you with milk, not with solid food, for you were not then able to take it. No, and even now you are not able; you are still worldly.
Hebrews 5:11
Now on this subject I have much to say, but it is difficult to explain it to you, because you have shown yourselves so slow to learn.
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