The spiritual building up of the body of Christ is achieved through love. As Saint Peter says: Like living stones you are built into a spiritual house, to be a holy priesthood, offering spiritual sacrifices acceptable to God through Jesus Christ. And there can be no more effective way to pray for this spiritual growth than for the Church, itself Christ's body, to make the offering of his body and blood in the sacramental form of bread and wine. For the cup we drink is a participation in the blood of Christ, and the bread we break is a participation in the body of Christ. Because there is one loaf, we who are many are one body, since we all share the same bread. And so we pray that, by the same grace which made the Church Christ's body, all its members may remain firm in the unity of that body through the enduring bond of love.
-- Saint Fulgentius of Ruspe from one of his works "The Sacrament of Unity and Love"
