Mark 4:13

And he said to them: Do you not understand this parable? And how then will you understand all parables?

As many as I love, I rebuke and chasten; be zealous, therefore, and repent.

Hear you, therefore, the parable of the sower.

Jesus said to them: Have you understood all these things? They said to him: Yes, Lord.

But Peter answered and said to him: Explain to us this dark saying.

And Jesus perceiving it, said to them: you of little faith! why are you reasoning among yourselves because you took no bread?

And when he had gone into the house, away from the multitude, his disciples asked him about the dark saying.

But the meaning of the parable is this: The seed is the word of God;

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

And I, brethren, was not able to speak to you, as to spiritual men, but as to those who are carnal, as to babes in Christ.

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

Treasury of Scripture Knowledge

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

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?