Chometz represents things that need many actions in order to come to fruition, all of which take time, just as a dough needs time in order to become chometz. Matzah symbolizes those things which require a minimum amount of human intervention, and are above and beyond the dimension of time.
Most people think that freedom means the ability to do whatever a person wants to do. In reality, however, true freedom is the realization that a person cannot just accomplish whatever he wants to accomplish. Rather the person realizes that they only have the ability to put in the effort and intention to accomplish something, but the ultimate success comes from God. When a person feels that accomplishment is up to him he feels a need to always do and accomplish as everything is dependent upon himself. There is no greater slavery than such an attitude. Any time a person feels that he must do something he is in slavery.
Our Sages teach us that no slave ever escaped from Egypt. The slaves felt that it was better the be a slave in Egypt than a nobleman elsewhere. They bought into the Egyptian notion of work being equal to accomplishment - that was their slavery, their addiction to work. In every generation a person must view himself as if he left Egypt; a person must see to it that he is not addicted to doing anything. Anything which a person feels he cannot stop doing is a violation of the Torah prohibition of returning to Egypt.
We therefore eat Matzah to show that we are not addicted to anything and we have left the servitude of Egypt to eternal freedom.

Our Sages teach us that no slave ever escaped from Egypt. The slaves felt that it was better the be a slave in Egypt than a nobleman elsewhere. They bought into the Egyptian notion of work being equal to accomplishment - that was their slavery, their addiction to work. In every generation a person must view himself as if he left Egypt; a person must see to it that he is not addicted to doing anything. Anything which a person feels he cannot stop doing is a violation of the Torah prohibition of returning to Egypt.
We therefore eat Matzah to show that we are not addicted to anything and we have left the servitude of Egypt to eternal freedom.