For our Lord used leaven both in a bad sense, as when He said, "Beware of the leaven of the Pharisees," [Matt. 16. 6; Luke, 12. 1.] and in a good sense, as when He said, "The kingdom of heaven is like unto leaven, which a woman took and hid in three measures of meal, till the whole was leavened." [Luke, 13. 21.] Now the rule in regard to this variation has two forms. For things that signify now one thing and now another, signify either things that are contrary, or things that are only different.
