Mark 4:10-13

And when he was alone, those around him with the twelve asked him about the parables. And he said to them, “To you has been given the secret of the kingdom of God, but for those outside everything is in parables, so that “‘they may indeed see but not perceive, and may indeed hear but not understand, lest they should turn and be forgiven.’” And he said to them, “Do you not understand this parable? How then will you understand all the parables?