That is not true, that is overgeneralizing. You can say it "infers" it, but that is up for debate; yet it does not SPEAK of it as it does unleavened bread. You are using MOLD as a substitute for YEAST on other foods? Sorry, but that is another species of fungus, and not what the Bible ever calls "Leaven". Grapes will ferment, but are not then necesarily "bad". They will also later mold, and that is when they are bad! Two separate types of fungus, no other relationship. Mushroom is yet another fungus, associated with decay (like growing on old tree stumps, etc) but they themselves are food. I have not made a "doctrine" out of it. Your side has made a doctrine out of leaven ALWAYS representing "corruption" meaning fermented beverages are always completely off limits. Yet this one parable disproves that generalization. If it is so universally bad, then why was it used in the parable as part of something good? (i.e. the bread should have grown using something else) Nobody's saying a broom was bad. If they were, then we could use this as an example of it having a good use But that one example disproves this generalization. Since "leaven" is symbolic there, it would fall under the same principle as the parables. You are the one building a doctrine off of symbolism. Remember, the yeast is DEAD in completely fermented wine anyway.