Mark 4:13

Then He said to them: "If you do not understand this story, how, indeed, can you understand any of my stories?

The people whom I dearly love, I always reprove and discipline. So keep on being earnest and once for all repent.

"Now listen closely to the story of the sower.

"Do you understand all these stories?" They answered Him, "Yes."

Then Peter said to Him, "Explain the maxim for us."

Jesus knew it and said, "Why are you discussing among yourselves the fact that you have no bread? Have you so little faith?

Now when He had left the crowd and gone home, His disciples were asking Him the meaning of this story.

This is what the story means: The seed is God's message.

Then He said to them, "O men sluggish in mind and slow in heart to believe all that the prophets have said!

So I myself, brothers, could not deal with you as spiritual persons, but as creatures of human clay, as merely baby Christians.

I have much to say to you about Him, but it is difficult to make it clear to you, since you have become so dull in your spiritual senses.

Treasury of Scripture Knowledge

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

And He answered them, "Are you too without understanding yet? Do you not know that nothing from the outside that goes into a man can make him foul,