Leaven

[Matt. 13:33] 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.
[This parable, while it teaches the same general truth as the foregoing one, holds forth, perhaps, rather the inward growth of the kingdom, while "the Mustard Seed" seems to point chiefly to the outward. It being a woman's work to knead, it seems a refinement to say that "the woman" here represents the Church, as the instrument of depositing the leaven. Nor does it yield much satisfaction to understand the "three measures of meal" of that threefold division of our nature into "spirit, soul, and body," by virtue of which it will yet mould all institutions and tribes of men. and exhibit over the whole earth one "kingdom of our L-rd and of His Messiah." In ancient Jewish literature Y’Shua and other Jews use leaven to represent several good things as well as bad. One of these good things was Shalom because you put a little leaven in and it rises up like the peace of G-d. It is a active force – good or bad.]
[34] All these things spake Jesus unto the multitude in parables; and without a parable spake he not unto them:
[That is, on this occasion; refraining not only from all naked discourse, but even from all interpretation of these parables to the mixed multitude.]
[35] That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.
[I will open my mouth in parables - Though the Psalm seems to contain only a summary of Israelites history, the Psalmist himself calls it "a parable," and "dark sayings from of old" - as containing, underneath the history, truths for all time, not fully brought to light till the Gospel day. (Ps. 78:2).]