John Chrysostom
Catena Aurea · Matthäusevangelium 13
Another parable spake 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.
The same thing the Lord sets forth in this parable of the leaven, as much as to say to His disciples, As leaven changes into its own kind much wheat-flour, so shall ye change the whole world. Note here the wisdom of the Saviour; He first brings instances from nature, proving that as the one is possible so is the other. And He says not simply ‘put,’ but hid; as much as to say, So ye, when ye shall be cast down by your enemies, then ye shall overcome them. And so leaven is kneaded in, without being destroyed, but gradually changes all things into its own nature; so shall it come to pass with your preaching. Fear ye not then because I said that many tribulations shall come upon you, for so shall ye shine forth, and shall overcome them all. He says, three measures, to signity a great abundance; that definite number standing for an indefinite quantity.