It is obvious, in the first place, from the references made to it both by the Lord and his apostles, and especially from the iteration of the same maxim by Paul in two distinct epistles, that the similitude was current and familiar among the people as a proverb. It is conceded, that apart from this parable, wherever its application is expressly indicated, it is employed to designate the progress of evil; but it ought to be borne in mind that Paul has twice, in the same words, enunciated the universal proposition, "A little leaven leaveneth the whole lump" (1 Cor. v. 6; Gal. v. 9). By expressly mentioning the leaven of malice and wickedness in connection with this proposition, he leaves room for the supposition that there may be also a leaven of truth and holiness. In like manner, the Lord in another place warns his followers to beware of the leaven of the Pharisees, which is hypocrisy; but he nowhere says that leaven is hypocrisy. Leaven does, indeed, illustrate the method in which falsehood spreads; but it may, for aught that is said in the Scriptures, illustrate also the manner in which truth advances, when it has gotten a footing in the world or in a man. If truth and error, though opposite in their nature, are like each other in their tendency to advance, as if by contagion; and if error is in this respect like leaven, then truth must be in this respect like leaven too. When two things are in a certain aspect like each other, and one of them is in the same aspect like a third thing, the other must also be like that third thing, provided the point of view remain unchanged. Leaven represents evil not in its nature, but only in the manner of its progress; and in this respect the symbol is equally applicable to the opposite good.