Theophilus to Autolycus

Consider, therefore, whether those who teach such things can possibly live indifferently, and be commingled in unlawful intercourse, or, most impious of all, eat human flesh, especially when we are forbidden so much as to witness shows of gladiators, lest we become partakers and abettors of murders. But neither may we see the other spectacles, lest our eyes and ears be defiled, participating in the utterances there sung. For if one should speak of cannibalism, in these spectacles the children of Thyestes and Tereus are eaten; and as for adultery, both in the case of men and of gods, whom they celebrate in elegant language for honours and prizes, this is made the subject of their dramas.

But far be it from Christians to conceive any such deeds; for with them temperance dwells, self-restraint is practiced, monogamy is observed, chastity is guarded, iniquity exterminated, sin extirpated, righteousness exercised, law administered, worship performed, God acknowledged: truth governs, grace guards, peace screens them; the holy word guides, wisdom teaches, life directs, God reigns. Therefore, though we have much to say regarding our manner of life, and the ordinances of God, the maker of all creation, we yet consider that we have for the present reminded you of enough to induce you to study these things, especially since you can now read [our writings] for yourself, that as you have been fond of acquiring information, you may still be studious in this direction also.