Clement of Alexandria

For conscience' sake, then, we are to abstain from what we ought to abstain. "Conscience, I say, not his own," for it is endued with knowledge, "but that of the other," lest he be trained badly, and by imitating in ignorance what he knows not, he become a despiser instead of a strong-minded man. "For why is my liberty judged of by another conscience? For if I by grace am a partaker, why am I evil spoken of for that for which I give thanks? Whatever ye do, do all to the glory of God"—what you are commanded to do by the rule of faith.