We want to follow Our Lord. We are anxious to spread his Word. From a human point of view, it's only natural that we should ask ourselves: who are we, for so many people? Compared with the total population of the world, even though there are millions of us, we are few in number. We must therefore see ourselves as a tiny measure of yeast, prepared and ready to do good to the whole of mankind, remembering the words of the Apostle: 'a little leaven is enough to leaven all the dough', transforming it completely. We have to learn to become that yeast, that leaven, and so modify and transform the multitude.
Is yeast, by its nature, better than dough? No. But it is what makes the dough rise and become good and nourishing food.
Reflect a moment, even if only in general terms, on the way yeast works in the making of bread — that simple, staple food which is available to everyone. In many places (you yourselves may have seen it done) the baking process is like a real ceremonial, ending up with a splendid product that you can almost taste with your eyes.
They start with good flour, of top quality if possible. Then the dough is worked in the kneading-trough and the yeast is mixed in. It is a long and patient job. The dough must now be left to rest; this is essential for the leaven to do its work and make the dough rise.
Meanwhile, the oven is made ready, its temperature rising as the logs of wood burn bright. The risen dough is placed in the glowing oven and turns into high quality bread, wonderfully light and fresh. This result would never have been possible had it not been for the small amount of leaven, which dissolved and disappeared among the other ingredients, working effectively and passing unnoticed.