Jesus and the Reign of God
The Kingdom Is like a Mustard Seed
Monday, November 16, 2020
The Kingdom of Heaven is like a mustard seed which a person took and sowed in a field. It is the smallest of all the seeds, but when it has grown it is the biggest of shrubs and becomes a tree, so that the birds of the air can come and shelter in its branches. —Matthew 13:31–32
The Reign of God is Jesus’ message, but he never describes it literally. He walks around it and keeps giving different images of the Real. For example, the mustard seed is very small and insignificant, and the kingdom is “like” that. Pliny the Elder, a contemporary of Jesus, wrote an encyclopedic book called Natural History, in which he describes all the plants that were known in the Mediterranean world. He says two main things about the mustard plant: it’s medicinal, and it’s a weed that cannot be stopped:
Mustard . . . with its pungent taste and fiery effect is extremely beneficial for the health. It grows entirely wild, though it is improved by being transplanted: but on the other hand when it has once been sown it is scarcely possible to get the place free of it, as the seed when it falls germinates at once. 
The two images on which Jesus is building in this parable of the mustard seed are a therapeutic image of life and healing, and a fast-growing weed. What a strange thing for Jesus to say: “I’m planting a weed in the world!” Jesus’ teachings of nonviolence and simplicity are planted and they’re going to flourish, even wildly so. The old world is over.
The virtue for living in the in-between times Jesus calls “faith.” He is talking about the grace and the freedom to live God’s dream for the world now—while not rejecting the world as it is. That’s a mighty tension that is not easily resolved.
There are always two worlds. The world as it is usually operates on power, ego, and success. The world as it could be operates out of love. One is founded on dominative power, and the other is a continual call to right relationship and reciprocal power. The secret of this Kingdom life is discovering how we can live in both worlds simultaneously.
 Pliny the Elder, Natural History, 19.170–171. See Pliny, Natural History, vol. 5, books 17–19, trans. H. Rackham (Harvard University Press: 1950), 528–529.
Adapted from Richard Rohr with John Bookser Feister, Jesus’ Plan for a New World: The Sermon on the Mount (Franciscan Media: 1996), 40–41.