Views During the Second Period (300-750 A.D.): The Doctrine of the Church (26): The Lord’s Supper; “The Eucharist” by John of Damascus

The body which is born of the virgin is in truth body united with divinity, not that the body which was received up into the heavens descends, but that the bread itself and the wine are changed into God's body and blood. But if you enquire how this happens, it is enough for you to learn that it was through the Holy Spirit, just as the Lord took on Himself flesh that subsisted in Him and was born of the holy mother of God through, the Spirit. And we know nothing further save that the Word of God...