In the Hagadah we say that the reason we eat Matza on Pesach is because the dough did not have a chance to rise until the Melech Malchei HaMilachim appeared to us and redeemed us. Why is this so integral to the story of our redemption that Matza takes center stage and plays the leading role on Pesach?
The Maharal explains that the whole point of the ten makos and all the miracles in Mitzrayim was to teach the world, and Bnei Yisroel as well, that Hashem created and controls everything that happens in the world. Man is so egocentrical that despite all of Hashem's miracles and all our own shortcomings, we easily forget this point. Without constant reminders we oftentimes believe that we control our own fate and destiny.
So too the Bnei Yisroel in Mitzrayim, despite witnessing all the miracles, at the time of leaving Mitzrayim may have entertained notions that they somehow freed themselves through their own efforts. Therefore Hashem caused them to leave at a time that was clearly not desirable to them. They would have preferred to finish baking their bread before embarking on their treacherous desert trek. Hashem wanted to leave this mark on us for generations and Matza symbolizes what Pesach is all about, belief in Hashem.