20 We do not turn the sacrifices of the Gentiles into love-feasts, as Faustus says we do. Our love-feasts are rather a substitute for the sacrifice spoken of by the Lord, in the words already quoted: "I will have mercy, and not sacrifice." At our love-feasts the poor obtain vegetable or animal food; and so the creature of God is used, as far as it is suitable, for the nourishment of man, who is also God's creature. You have been led by lying devils, not in self-denial, but in blasphemous error, "to abstain from meats which God has created to be received with thanksgiving of them which believe and know the truth.
For every creature of God is good, and nothing to be refused, if it be received with thanksgiving." In return for the bounties of the Creator, you ungratefully insult Him with your impiety; and because in our love-feasts flesh is often given to the poor, you compare Christian charity to Pagan sacrifices. This indeed, is another point in which you resemble some Pagans. You consider it a crime to kill animals, because you think that the souls of men pass into them; which is an idea found in the writings of some Gentile philosophers, although their successors appear to have thought differently. But here again you are most in error: for they dreaded slaughtering a relative in the animal; but you dread the slaughter of your god, for you hold even the souls of animals to be his members.
Source: Reply to Faustus the Manichaean (New Advent)