You cannot drink the cup of the Lord, and the cup of demons: you cannot be partakers of the Lord's table, and of the table of demons.
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Anyone who drinks the cup of demons insults the cup of Christ, and anyone who eats at the table of demons revolts against the table of Christ, that is to say, the altar of the Lord, and crucifies his body again. Commentary on Paul’s Epistles.
Also the blessed apostle has said, "Ye cannot drink the cup of the Lord and the cup of devils; ye cannot be partakers of the Lord's table and of the table of devils.".
That we are not saying this dishonestly, our former letters have proved, wherein we have declared our opinion to you with a very plain statement, both against those who had betrayed themselves as unfaithful by the unlawful presentation of wicked certificates, as if they thought that they would escape those esnaring nets of the devil; whereas, not less than if they had approached to the wicked altars.
Also, the apostle testifies, and says, "Ye cannot drink the cup of the Lord and the cup of devils; ye cannot be partakers of the Lord's table and of the table of devils."
In all this discourse, a comparison is instituted between the Christian host and oblation, its effects, conditions and properties, with the altars, hosts, sacrifices and immolations of the Jews and Gentiles; which the apostle could not have done, had there not been a proper sacrifice in the Christian worship. The holy Fathers teach the same with the ancient Councils. This in the council of Nice: The lamb of God laid upon the altar. Conc. Ephes., The unbloody service of the sacrifice. In St. Cyril of Alexandria, in Conc. Ephes., Anath. 11, The quickening holy sacrifice; the unbloody host and victim. Tertullian, de coron. milit., The propitiatory sacrifice both for the living and the dead. This Melchisedech did most singularly prefigure in his mystical oblation of bread and wine; this also according to the prophecy of Malachi as, shall continue from the rising to the setting sun, a perpetual substitute for all the Jewish sacrifices; and this, in plain terms, is called the Mass, by St. Au...
Nor do we dislike the temples less than the monuments: we have nothing to do with either altar, we adore neither image; we do not offer sacrifices to the gods, and we make no funeral oblations to the departed; nay, we do not partake of what is offered either in the one case or the other, for we cannot partake of God's feast and the feast of devils.