4th Century
St. Ambrose of Milan
Patristic Period
"Before it is consecrated, it is bread, but when the words of Christ have been added, it is the body of Christ. Therefore hear him saying: Take and eat ye all of it; for this is my body. And before the words of Christ it is a cup full of wine and water. When the words of Christ have operated, then and there it is made to be the blood of Christ which redeemed the people. "
On the Sacraments
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