Christ gives us his Body in the Eucharist, he gives himself in his Body and thus makes us his Body, he unites us with his Risen Body. If man eats ordinary bread, in the digestive process this bread becomes part of his body, transformed into a substance of human life. But in holy Communion the inverse process is brought about. Christ, the Lord, assimilates us into himself, introducing us into his glorious Body, and thus we all become his Body.
Pope Benedict XVI
General Audience on December 10, 2008