Mark 4:13
Then Jesus said to them, "Do you not understand this parable? Then how will you understand any of the parables?

Isaiah 28:9, 10
Who is it He is trying to teach? To whom is He explaining his message? To infants just weaned from milk? To babies removed from the breast? . . .

Jeremiah 5:4, 5
Then I said, "They are only the poor; they have played the fool, for they do not know the way of the LORD, the justice of their God. . . .

Matthew 15:16, 17
"Do you still not understand?" Jesus asked. . . .

Matthew 16:11
How can you not understand that I was not telling you about bread? But beware of the yeast of the Pharisees and Sadducees."

Luke 24:25
Then Jesus said to them, "O foolish ones, how slow are your hearts to believe all that the prophets have spoken.

John 3:10
"You are Israel's teacher, " said Jesus, "and you do not understand these things?

1 Corinthians 3:2
I gave you milk, not solid food, for you were not yet ready for solid food. In fact, you are still not ready,

Hebrews 5:11
We have much to say about this, but it is hard to explain, because you are dull of hearing.