Matthew 13:33

“Another parable spake he unto them, etc.] To the disciples and the multitude, and which was of the same kind, to the same purpose, and relating to the same subject as the former; the spread of the Gospel, and the increase of it in the world. The kingdom of heaven is like unto leaven. The word “leaven” is every where else used in a bad sense; and either designs immorality, as malice and wickedness, or false doctrine, such as that of the Pharisees and Sadducees: but here it seems to be taken in a good sense, and the Gospel to be compared unto it; nor for its disagreeable qualities, but on account of its small quantity; it is a little leaven that leavens the whole lump, and may express, as the…”

“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," alluded to in Th1 5:23, or of…”

“The kingdom of heaven - The meaning here is the same as in the last parable; perhaps, however, intending to denote more properly the secret and hidden nature of piety in the soul. The other parable declared the “fact” that the gospel would greatly spread, and that piety in the heart would greatly increase. This states the “way” or “mode” in which it would be done. It is secret, silent, steady; pervading all the faculties of the soul and all the kingdoms of the world, as leaven, or yeast, though hidden in the flour, and though deposited only in one place, works silently until all the mass is brought under its influence. Three measures - These were small measures (see the margin); but the…”

“Three measures - This was the quantity which they usually baked at once: till the whole was leavened - Thus will the Gospel leaven the world and grace the Christian. Luk 13:20. Matthew 13:34”

“13:33 Normally yeast refers to the influence of evil (e.g., 16:6; 1 Cor 5:6; Gal 5:9); here, however, it is positive, speaking of the all-pervasive influence of the Kingdom.”

“Another: Mar 13:20 like: Luk 13:21; Co1 5:6, Co1 5:7; Gal 5:9 measures: Gr. "A measure containing about a peck and a half, wanting a little more than a pint." till: Job 17:9; Pro 4:18; Hos 6:3; Joh 15:2, Joh 16:12, Joh 16:13; Phi 1:6, Phi 1:9, Phi 2:13-15; Th1 5:23, Th1 5:24; Pe2 3:18 Matthew 13:34”