You are what you have received

... I promised you, who have now been baptized, a sermon in which I would explain the Sacrament of the Lord's Table, which you now look upon and of which you last night were made participants. You ought to know what you have received, what you are going to receive, and what you ought to receive daily. That Bread which you see on the altar, having been sanctified by the word of God, is the Body of Christ. That chalice, or rather, what is in that chalice, having been sanctified by the word of God, is the Blood of Christ. Through that bread and wine the Lord Christ willed to commend His Body and Blood, which He poured out for us unto the forgiveness of sins. If you receive worthily, you are what you have received.

—Augustine of Hippo in his Sermon 227