Jesus also used this illustration: “The Kingdom of Heaven is like the yeast a woman used in making bread. Even though she put only a little yeast in three measures of flour, it permeated every part of the dough.”
Jesus always used stories and illustrations like these when speaking to the crowds. In fact, he never spoke to them without using such parables. This fulfilled what God had spoken through the prophet:
“I will speak to you in parables.
I will explain things hidden since the creation of the world.”