The eating of matza and the abstention from Hametz are not simply a commemoration of the events that occurred in the exodus from Egypt, but rather represent our actual participation in those events.
Many mitzvot are performed in remembrance of the exodus from Egypt, but on Pesach we do more than that — in a certain sense–we personally and communally re-experience the process of the Exodus.
Eating matza on Pesach, then, constitutes a revitalization of the essence of the Exodus, which in the human soul means rising to a different level and different form of awareness.
–Rabbi Adin Steinsaltz