Mark 4:10-12

10And when he was alone, they that were about him with the twelve asked of him the parables. 11And he said unto them, Unto you is given the mystery of the kingdom of God: but unto them that are without, all things are done in parables: 12that seeing they may see, and not perceive; and hearing they may hear, and not understand; lest haply they should turn again, and it should be forgiven them.