How do we know the leaven represents the kingdom of God?

In Matthew 13:33, Jesus explains how the kingdom of heaven is like leaven, which a woman hid in three measures of meal until the whole was leavened. This imagery demonstrates that the influence of God’s kingdom begins subtle but eventually transforms all aspects of life, much like leaven affects the entirety of the dough. This indicates that the kingdom of God is an active, pervasive force, subtly working within and through believers to bring about spiritual transformation across the world. The parable assures us that even small actions in the spread of the gospel can lead to significant results.