"The Easter proclamation spreads throughout the world with the joyful song of the Alleluia. Let us sing it with our lips, and let us sing it above all with our hearts and our lives, with a manner of life that is "unleavened", that is to say, simple, humble, and fruitful in good works. "Surrexit Christus spes mea: precedet suos in Galileam" – Christ my hope is risen, and he goes before you into Galilee. The Risen One goes before us and he accompanies us along the paths of the world. He is our hope, He is the true peace of the world. Amen!"From Pope Benedict XVI's Easter homily today. (HT: Blog by the Sea)
The reference to unleavened bread comes from Scripture:
“This boasting of yours is an ugly thing. Do you not know that a little leavening has its effect all through the dough? Get rid of the old leavening to make yourselves fresh dough, unleavened loaves, as it were; Christ our Passover has been sacrificed. Let us celebrate the feast not with the old leavening, that of corruption and wickedness, but with the unleavened bread of sincerity and truth” (I Cor. 5:6-8).
“Be on guard against the leaven of the Pharisees, which is hypocrisy” (Lk. 12:1).
“They finally realized he was not issuing a warning against leavening, used for bread, but against the Pharisees' and the Sadducees' teaching” (Mt. 16:12).
You can see from those what "unleavened" lives look like -- as the Pope says:
simple, humble, and fruitful in good works
So that is #1 on my examen! Believe me, I have a ways to go!
(ETA: Fr Jaki quote on the Pasch and the Papacy, at GKC's Favourite -- seems to relate a bit to this leavening theme).