Tertullian

" No doubt he used to please them by celebrating the Saturnalia and New-year's day! [Was it so] or was it by moderation and patience? by gravity, by kindness, by integrity? In like manner, when he is saying, "I have become all things to all, that I may gain all," does he mean "to idolaters an idolater? ""to heathens a heathen? ""to the worldly worldly? "But albeit he does not prohibit us from having our conversation with idolaters and adulterers, and the other criminals, saying, "Otherwise ye would go out from the world," of course he does not so slacken those reins of conversation that, since it is necessary for us both to live and to mingle with sinners, we may be able to sin with them too.