For we being many are one bread, and one body: for we are all partakers of that one bread.
All Commentaries on 1 Corinthians 10:17 Go To 1 Corinthians 10
Augustine of Hippo
AD 430
The one who is properly said to eat the body of Christ and to drink his blood is the one who is incorporated into the unity of his body. Heretics and schismatics can receive the sacrament but to no avail—in fact, to their harm—since the result is to increase their pain rather than to curtail the length of their punishment.