I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteems anything to be unclean, to him it is unclean.
Read Chapter 14
Cyril of Alexandria
AD 444
Christ had said: “Not what goes into the mouth defiles a man but what comes out of the mouth—this defiles a man.” This applies to food as well. .
Nothing is unclean of itself. Because the law that made them unclean, is not now binding of itself, yet a man must not act against his conscience, neither must he, when he can avoid it, scandalize or offend the weak: nor cause divisions or dissensions. (Witham)