Another parable spoke he unto them;
The kingdom of heaven is like unto leaven, which a woman took, and hid in three measures of meal, till the whole was leavened.
All Commentaries on Matthew 13:33 Go To Matthew 13
Jerome
AD 420
The woman who took the yeast and mixed it with three measures of flour until the whole batch of dough was fermented signifies to me either the apostolic preaching or the church, which is made up of different nations. She takes the yeast—namely, the knowledge and understanding of the Scriptures—and mixes it with three measures of flour so that the spirit, soul and body blended into one might not differ from each other but intermingle, obtaining from the Father whatever they ask for. This point is examined also elsewhere. We read in Plato, and it is the teaching of famous philosophers, that there are three passions in the human soul: one, which we may interpret as rational; another, which we call full of anger or irascible; a third, which we call desire. This great philosopher believed that our rational part resides in the brain, anger in the gall bladder and desire in the liver. Therefore, if we accept the evangelical yeast of sacred Scripture that we spoke about, the three passions of the human soul are blended into one, so that in reason we possess prudence, in anger we possess hatred toward vice, in desire the aspiration for virtue. And this all happens through the gospel teaching that holy mother, the church, offers us. .
