Sfat Emet (Rabbi Yehudah Leib Alter of Ger):

For "memory"
(or "mindfulness") is a point within, one where there is not forgetfulness. This point is regularly revealed on Shabbat, where it is kept ("shamor") and guarded ("zachor") from flowing into a place where there is no memory or mindfulness.

The same is true of the redemption from Egypt. On every Pesach you become like a new person, like the newborn child each of us was as we came forth from Egypt. The point (of memory or mindfulness) implanted in our hearts is renewed.

That point is called "lehem oni" because it is totally without expansion . . . Our task is really to expand that point, to draw all our deeds to follow it.

Paraphrase of the Sfat Emet:

The dough did not rise when we left Egypt -- that was the moment of divine emanation, the moment we were in touch with ourselves (our individual "inner points") and together as a community. So we eat matzah today at the seder and all week as a physical re-experience of that moment.

Eating matzah during the week of Passover with this in mind is a way to remember who we are -- and the rest of the year we can draw from this one week of remembering.