-- G. K. Chesterton, Orthodoxy
- - - - - - - - - -For us who have been called to live a life of holiness through faith the true lamb has been sacrificed, the lamb that takes away the sin of the world. To this sacrifice we must add a food that is spiritual, wholly good, and truly sacred, a food typified in the law by the unleavened bread, which we now understand in a spiritual way.
In the divinely inspired scriptures yeast always signifies wickedness and sin. Our Lord Jesus Christ, warning his holy disciples to be on their guard, said: Beware of the yeast of the scribes and Pharisees. And Paul in his great wisdom wrote that those who have once been sacrificed should put far from them the yeast of impurity that corrupts mind and heart. Purify yourselves of the old yeast, he urged, and become a fresh batch of bread, since you really are unleavened.
This urgent plea prompted by concern for our well-being shows that spiritual communion with Christ the Savior of us all is not only a benefit to us but also a real need. It also shows how important it is for us to keep our minds pure by refraining from sin and washing away every stain. In a word, we must avoid everything that defiled us in the past, for it is then, when no fault of ours bars the way and we are wholly free from reproach, that we shall open the way to this communion with Christ.
-- Cyril of Alexandria, Paschal Homilies 19, 2: PG 77, 824-825