Then understood they. Jesus did not explain his meaning further; but his reproof roused their intellect, made them reflect, set them on the road to the truth. The doctrine. This was what Jesus meant by "the leaven."
In a wider sense it might include practice as well as precept, manner of life as well as teaching. The same spirit permeated all. "See," says St. Chrysostom, "how much good his reproof wrought. For it both led them away from the Jewish observances, and, when they were remiss.
made them more heedful, and delivered them from want of faith; so that they were not afraid nor in alarm, if at any time they seemed to have few loaves; nor were they careful about famine, but despised all these things."