50 Cyril, the Bishop of Alexandria, is in wonderful harmony with John, the Bishop of Constantinople, when he writes in his commentary on the Gospel of St. Matthew: "He said This is my body and this is my blood in a demonstrative fashion, so that you might not judge that what you see is a mere figure; instead the offerings are truly changed by the hidden power of God Almighty into Christ's body and blood, which bring us the life-giving and sanctifying power of Christ when we share in them." (54)
Source: Mysterium Fidei (Vatican.va)