However much this view of the Sacramental mystery may differ from later theories, it was certainly held by many of the Greek Fathers.  Irenæus, for example, in addition to those already mentioned, thus writes:  “When therefore both the mingled cup and the created bread receive the Word of God, and the Eucharist becomes the Body of Christ, and from these the substance of our flesh increaseth and consisteth, how say they that the flesh is incapable of the gift of God which is eternal life, that flesh which is nourished from the Body and Blood of the Lord, and is already (ὑπάρχουσα) a member of Him?—even as the blessed Paul saith, that we are members of His Body, of His Flesh, and of His Bones V. ii. § 3..”