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.
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Theophylact of Ochrid
AD 1107
. He calls the apostles leaven as well as a grain of mustard seed. For just as the leaven, although it is small, transforms to itself all the flour, so you will transform the whole world, though you are few. Some understand the leaven to be the preaching; the three measures are the three faculties of the soul — the abilities to reason, to be stirred into action, and to desire — and the woman is the soul which hides the preaching within all three of its faculties, so that it is all mixed together, leavened, and sanctified. So every part of us must be leavened and transformed into that which is more Godlike. For He says, "till it was all leavened."