The mustard seed becomes a great shrub that shelters the birds, recalling ancient images of the tree of life. We’d expect a cedar or a sequoia, but Jesus finds the power of God better imaged in a tiny, no-account seed. It’s not the way we expect divine activity to look. Yet the tree of life is here, in the cross around which we gather, the tree into which we are grafted through baptism, the true vine that nourishes us with its fruit in the cup we share. It may not appear all that impressive, but while nobody’s looking it grows with a power beyond our understanding.
Mark 4:26-34
26[Jesus] said, “The kingdom of God is as if someone would scatter seed on the ground,27and would sleep and rise night and day, and the seed would sprout and grow, he does not know how. 28The earth produces of itself, first the stalk, then the head, then the full grain in the head. 29But when the grain is ripe, at once he goes in with his sickle, because the harvest has come.”
30He also said, “With what can we compare the kingdom of God, or what parable will we use for it? 31It is like a mustard seed, which, when sown upon the ground, is the smallest of all the seeds on earth; 32yet when it is sown it grows up and becomes the greatest of all shrubs, and puts forth large branches, so that the birds of the air can make nests in its shade.”
33With many such parables he spoke the word to them, as they were able to hear it; 34he did not speak to them except in parables, but he explained everything in private to his disciples.