Cross reference
Matthew 13:10
10 And the disciples came and said to him, Why do you say things to them in the form of stories?
Mark 4:33-34
33 And with a number of such stories he gave them his teaching, as they were able to take it:
34 And without a story he said nothing to them: but privately to his disciples he made all things clear.
Mark 4:10
10 And when he was by himself, those who were round him with the twelve put questions to him about the purpose of the stories.