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
So by bread you are instructed as to how you ought to cherish unity. Was that bread made of one grain of wheat? Were there not, rather, many grains? However, before they became bread, these grains were separate. They were joined together in water after a certain amount of crushing. For unless the grain is ground and moistened with water, it cannot arrive at that form which is called bread. So, too, you were previously ground, as it were, by the humiliation of your fasting and by the sacrament of exorcism. Then came the baptism of water. You were moistened, as it were, so as to arrive at the form of bread. But without fire, bread does not yet exist.