Exod 12:8

“Christians eat the flesh of the lamb every day, that is, they consume daily the flesh of the Word. "For Christ our pasch is sacrificed." And because the law of the pasch is such that it is eaten in the evening, for this reason the Lord suffered in the evening of the world, that you may always eat of the flesh of the Word, because you are always in the evening until the morning comes. And if in this evening you shall be anxious and "in weeping and fasting" and shall lead your life in every labor of justice, you shall be able to say, "In the evening weeping shall have place and in the morning gladness." For you shall rejoice in the morning, that is, in the world to come, if in this world you have gathered "the fruit of justice" in weeping and labor.”

“And we must eat the meat roasted with fire with unleavened bread. For the Word of God is not only flesh. He says, indeed, "I am the bread of life," and "This is the bread which comes down from heaven that one may eat of it and not die. I am the living bread which came down from heaven. If anyone eat of this bread he shall live forever."36We must not, however, fail to remark that all food is loosely said to be bread, as it is written in the case of Moses in Deuteronomy: "He did not eat bread for forty days, and he did not drink water," instead of saying he partook of neither dry nor wet nourishment. Now I have noted this because it is also said in the Gospel according to John, "And also the bread which I shall give for the life of the world is my flesh."”

“Then too the unleavened bread is commanded to be eaten with bitter herbs; nor is it possible to attain the promised land unless we pass through bitterness. For just as physicians put bitter substances in medicines with a view to the health and healing of the infirm, so also the Physician of our souls with a view to our salvation has wished us to suffer the bitterness of this life in various temptations. [He knows] that the end of this bitterness gains the sweetness of salvation for our soul, just as, on the contrary, the end of the sweetness found in corporeal pleasure, as the example of that rich man teaches, brings a bitter end: torments in hell.”

“But we eat the flesh of the lamb and the unleavened bread with bitter herbs either by being grieved with a godly grief because of repentance for our sins, a grief which produces in us a repentance unto salvation which brings no regret, or by seeking and being nurtured from the visions of the truth which we discover because of our trials.”

“Yet they were also completely ignorant of the commands of Moses himself, who ordered them specially to eat this bitterness when he established the paschal sacraments for them to observe and said, "You will eat it with bitterness, for it is the pasch of the Lord." For he did not order, as they think, the consuming of the very bitter juices of insignificant herbs with the roasted flesh of a lamb. Rather, he commanded the fruitful devouring of the bitter words of Christ's precepts with the sacrament of the Lord's passion. For do not the words of the Lord seem to be bitter when he says: "If you wish to be perfect, leave all that you have and come, follow me?" And when he says that one is not to possess two tunics or a wallet or sandals, that bitterness of such words is a medicine for souls.”

“Concerning this lamb it is added further: "And they shall eat the flesh that night roasted with fire." Indeed we eat the lamb at night, because we now receive the Lord's body in the sacrament when we do not yet see one another's consciences. Yet these meats must be roasted with fire, because fire indeed dissolves the meats that water has boiled; but those that fire cooks without water, it strengthens. And so fire cooked the meats of our Lamb, because the very power of His passion rendered Him stronger for resurrection and strengthened Him for incorruption. For He who recovered from death—clearly His flesh was hardened by fire. Hence also through the Psalmist He says: "My strength has dried up like a potsherd." For what is a potsherd before fire except soft clay? But it is subjected to fire so that it may become solid. Therefore the strength of His humanity dried up like a potsherd, because from the fire of passion it grew into the power of incorruption. But having received the sacraments of our Redeemer alone is not sufficient for the true solemnity of the mind, unless good works are also joined to them. For what does it profit to receive His body and blood with the mouth, and to oppose Him with perverse conduct? Hence it is well added concerning the eating: "And unleavened bread with wild lettuce." For he eats bread without leaven who performs righteous works without the corruption of vainglory, who shows the commands of mercy without admixture of sin, lest he wickedly seize what he seems to dispense rightly. They had also mixed this leaven of sin into their good action, to whom the Lord spoke through the voice of the prophet in rebuke: "Come to Bethel and act impiously." And after a few words: "And sacrifice praise from what is leavened." For he offers praise from what is leavened who prepares a sacrifice to God from robbery. Wild lettuces are indeed very bitter. Therefore the flesh of the Lamb must be eaten with wild lettuces, so that when we receive the body of the Redeemer, we afflict ourselves with weeping for our sins, so that the very bitterness of repentance may cleanse from the stomach of the mind the humor of a perverse life.”