It is to be noted that there is no such thing as Communion without a sacrifice. Just as we cannot have the natural communion of eating, unless vegetables have been torn up from their roots and subjected to fire, and animals have been subjected to the knife and slain, and then submitted to purgation, so neither can we have Communion with Christ unless there is first a death. That is why the Mass is not just a Communion service; it is a sacrifice which ends in communion. Communion is the consequence of Calvary; we live by what we slay. Our bodies live by the slaying of the beasts of the field and the plants of the garden; we draw life from their crucifixion; we slay them not to destroy but to have life more abundantly. We immolate them for the sake of communion.

By a beautiful paradox of Divine love, God makes His Cross the very means of our salvation and our life. We have slain Him; we have nailed Him there and crucified Him; but the Love in His eternal Heart could not be extinguished. He willed to give us the very life we slew; to give us the very Food we destroyed; to nourish us with the very Bread we buried, and the very Blood we poured forth. He made our very crime into a happy fault; He turned a Crucifixion into a Redemption; a Consecration into a Communion; a death into Life Everlasting.

A Fulton Sheen Reader
Bishop Fulton Sheen