Jesus said, “How can I describe the Kingdom of God? What story should I use to illustrate it?
It is like a mustard seed planted in the ground. It is the smallest of all seeds,
but it becomes the largest of all garden plants; it grows long branches, and birds can make nests in its shade.”
Jesus used many similar stories and illustrations to teach the people as much as they could understand.
In fact, in his public ministry he never taught without using parables; but afterward, when he was alone with his disciples, he explained everything to them.