Mark 4:13

He said to them, "Don't you understand this parable? Then how will you understand any parable?

All those I love, I rebuke and discipline. So be earnest and repent!

"So listen to the parable of the sower:

"Have you understood all these things?" They replied, "Yes."

But Peter said to him, "Explain this parable to us."

When Jesus learned of this, he said, "You who have such little faith! Why are you arguing among yourselves about having no bread?

Now when Jesus had left the crowd and entered the house, his disciples asked him about the parable.

"Now the parable means this: The seed is the word of God.

So he said to them, "You foolish people -- how slow of heart to believe all that the prophets have spoken!

So, brothers and sisters, I could not speak to you as spiritual people, but instead as people of the flesh, as infants in Christ.

On this topic we have much to say and it is difficult to explain, since you have become sluggish in hearing.

Treasury of Scripture Knowledge

And he said unto them, Know ye not this parable? and how then will ye know all parables?

Evil people do not understand justice, but those who seek the Lord understand it all.

He said to them, "Are you so foolish? Don't you understand that whatever goes into a person from outside cannot defile him?