Mark 4:30-34

And he told them this parable: “How can I describe God’s kingdom realm? Let me illustrate it with this parable. It is like the mustard seed, the tiniest of all the seeds, yet when it springs up and grows, it becomes the largest plant in the garden, with so many large spreading branches, even birds can nest in its shade.” Jesus used many parables such as these as he taught the people, and they learned according to their ability to understand. He never spoke to them without using parables, but would wait until he was alone with his disciples to explain to them their meanings.