Why watch out for yeast?
It is only one slight difference in an ingredient in breads. A tortilla or cracker is remarkable different from San Francisco sour dough bread. The difference is yeast.
Jesus is challenging me to understand that this is a spiritual issue, not a physical issue.
I am to keep a sharp eye for the yeast of Religious Leaders and elites. It doesn’t take much yeast for it to cause bread to rise. The result is remarkably different. So it was with the doctrines of the Religious Leaders. They are insinuating, artful, plausible. They conceal the real tendency of their doctrines; they instill them secretly into the mind, until they pervaded all my faculties like leaven.