The Talmud in Tractate Berachos ( 17a) poses the question why it is forbidden to eat or posses chametz, leaven, such as bread, on Passover. What is there in the nature of leaven that it should be forbidden on Passover? And why is matza the most desirable food for Passover?
Instead of providing us with a straight answer, the Talmud responds by asking still another question. Why do people sin altogether? Understanding that people will continue to transgress, the Talmud tries to analyze the paradoxical situation in which many people find themselves: Man's desire to do good and his constant encounter with his/her evil inclination. Realizing that this inclination is difficult to overcome, it suggests that human beings and especially Jews should make the following declaration whenever they try to obey the laws of the Torah but fail to do so:
"Lord of the Universe
It is well known to You that it is our desire to do Your will
But what prevents us?
The yeast in the dough."
The expression: "The yeast in the dough" is well known in the Talmud. It is the description for the evil impulse in human beings. The last is the one that is responsible for "all ferment in the human heart" and why man does not always behave the way he should.
We now understand the circuitous answer the Talmud provides to the original question concerning the reasons why it is forbidden to possess or consume leaven on Passover.
Leaven is, after all, used to cause the yeast in the dough to rise and in a literal sense it is exactly that which also causes bread to become bread that is forbidden on Passover.
In other words: It is the most distinct symbol of the cause of all human transgressions!
This however begs the question. Why is the evil inclination symbolized by leaven? What does leaven do wrong that it should be used as the symbol for the evil urge in man?
A closer look however reveals a most fascinating idea.
Bread, chametz, is blown up matza. It is matza that went overboard and became "wild".
What is, after all, the essential difference between both? They are made from exactly the same ingredients. It is only the speed that makes the difference between the two. If the dough is baked quickly you get matza. However, if the dough is left for a while, it will rise and after being baked turns into bread.
The only real difference between the two is therefore hot air. An ingredient of no real substance!
And it is this substance which makes bread look powerful in comparison to matza. It rises, becoming haughty, making the impression that it consists of a great amount of substance and abundance while in reality it mainly consists of hot air. The matza, however is humble, there is no attempt to make more of itself than what it really contains: plain dough.
Bread, then, is an arrogant matza. And it is for this reason that it symbolizes the evil inclination since it is the attitude of haughtiness, blowing oneself up beyond one's real self which leads to undesirable acts that causes man to go astray. It is the source of all transgressions. Would a human being be humble, he or she would not contemplate doing anything wrong. Only arrogance leads man to undesirable deeds.
On Passover, which symbolizes the beginning of the Jewish people, Jews are once more reminded that their mission to become a light to the nations can only start in the spirit of humility. Arrogance can never be the foundation of spirituality and moral integrity. It cannot inspire others, nor will it have a lasting effect.
Consequently the art achieving real life is to be like a matza in a world of chametz.