The Mustard Seed and the Yeast

Hold out your hand. Imagine a seed sitting in your palm, so small you could lose it in a crease of your skin. Now imagine birds building their nests in what it becomes.

Jesus is by the Sea of Galilee, teaching the crowds in parables. He has already told them about a farmer scattering seed, and about weeds growing up among the wheat. Perhaps some of his listeners are wondering. If God's kingdom is really arriving, why does it look so small? A teacher from Nazareth. A handful of fishermen. A few villages by a lake. It hardly looks like the reign of God. So Jesus gives them two little pictures. One from the field. One from the kitchen.

“The kingdom of heaven,” he says, “is like a mustard seed that a man took and planted in his field.” His listeners smile. Everybody knows the mustard seed. It's what people mention when they want to say something is tiny. Jesus says so himself: among the seeds they sow, it's the smallest. You'd barely feel it drop from your fingers. The man presses it into the earth and walks away. Nothing to see.

But wait a season. The seed splits. A shoot pushes up through the soil. And it keeps on going. It grows bigger than all the garden plants around it, until it becomes a tree, tall and spreading. Then the birds come. They flutter in, perch on its branches, and build their nests there. The thing you could hardly see is now a home. Some of Jesus' listeners may have caught an echo here. The prophets used the picture of a great tree, with birds nesting in its branches, to describe a mighty kingdom.

Then Jesus tells a second story, this time from the kitchen. “The kingdom of heaven is like yeast that a woman took and mixed into three measures of flour, until it was all leavened.” Picture her early in the morning, before the heat of the day. A small lump of fermented dough, saved from yesterday's baking. She works it into a great heap of flour, pressing and folding, until you can't see the yeast at all. Hidden. Then she covers the bowl and waits.

Nothing happens. Not at first. But inside that dough, something is quietly at work. Slowly the whole mass begins to rise and swell, soft and alive, until every last bit of it has been changed. You can't point to the yeast anymore. But you can see what it has done, everywhere. Two stories. A seed that grows out in the open, huge and impossible to miss. Yeast that works in secret, until it fills everything. Small beginnings. Unstoppable endings.

Here's a detail the first listeners would have noticed. Three measures of flour is not a little light baking. Scholars estimate it at around forty litres of flour, enough to make bread for well over a hundred people. It's the same amount Sarah used in the book of Genesis, when three visitors came to Abraham's tent and Abraham told her to bake for them quickly. So this woman isn't making a snack. She's baking for a feast. And a tiny bit of yeast is enough for all of it.

The Mustard Seed and the Yeast. You'll find them in Matthew chapter 13, verses 31 to 33. God's kingdom often starts in ways that are easy to miss: a seed in a field, a little yeast in a bowl, one act of kindness, one quiet prayer. But God doesn't measure things the way we do. So here's the question to carry with you. What small thing might God be growing through you, even if no one can see it yet?