And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables: That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them. Mark 4:11-12When I was a kid in sunday school, I was told that Jesus' parables were object lessons to make the ideas easier to understand. However, that's not what Jesus said.
Jesus explains to his disciples that he speaks in parables so that it will be harder for the other people to understand. So that maybe they'll hear the truth, but not understand it, so they won't be saved. So, when I'm told that Jesus want to save everyone, I'll just point them to this verse.
The Brick Testament portrays this passage with Lego action figures.
The Use of Parables Explained