11 Since, then, neither the apostle himself nor an angel from heaven can preach or teach any otherwise than Christ has once taught and His apostles have announced, I wonder very much whence has originated this practice, that, contrary to evangelical and discipline, water is offered in some places in the Lord's cup, which water by itself cannot express the blood of Christ. The Holy Spirit also is not silent in the Psalms on the sacrament of this thing, when He makes mention of the Lord's cup, and says, “Your inebriating cup, how excellent it is!” Now the cup which inebriates is assuredly mingled with wine, for water cannot inebriate anybody.
And the cup of the Lord in such wise inebriates, as Noe also was intoxicated drinking wine, in Genesis. But because the intoxication of the Lord's cup and blood is not such as is the intoxication of the world's wine, since the Holy Spirit said in the Psalm, “Your inebriating cup,” He added, “how excellent it is,” because doubtless the Lord's cup so inebriates them that drink, that it makes them sober; that it restores their minds to spiritual wisdom; that each one recovers from that flavour of the world to the understanding of God; and in the same way, that by that common wine the mind is dissolved, and the soul relaxed, and all sadness is laid aside, so, when the blood of the Lord and the cup of salvation have been drunk, the memory of the old man is laid aside, and there arises an oblivion of the former worldly conversation, and the sorrowful and sad breast which before was oppressed by tormenting sins is eased by the joy of the divine mercy; because that only is able to rejoice him who drinks in the Church which, when it is drunk, retains the Lord's truth..
Source: The Epistles of Cyprian (New Advent)