[UAH] Quote of the Early Fathers and Christians of the Church (33AD to 750AD):

The Lord Jesus Himself proclaims: "This is My Body" (Mt. 26:26). Before the blessing of the heavenly words, another nature is spoken of, after the consecration, the Body is signified. He Himself speaks of His Blood. Before the consecration, it has another name; after, it is called Blood. And you say: "Amen," that is, "It is true." Let the heart within confess what the mouth utters; let the soul feel what the voice speaks.

St. Ambrose of Milan (340-397AD) on the Eucharist Mini-Bio: German; bishop, Doctor of the Church.

Paul Mugerwa