Romans 14:20

Giving this name to the salvation of a brother, and adding greatly to the fears, and showing that he is doing the opposite of that he desires. For thou, he says, art so far from building up as thou intendest, that thou dost even destroy, and that a building too not of man but of God, and not for any great end either, but for a trivial thing. For it was "for meat," he says. Then lest so many indulgences should confirm the weaker brother in his misconception, he again becomes doctrinal, as follows, "All things indeed are pure, but it is evil for that man who eateth with offence." Who does it, that is, with a bad conscience. And so if you should force him, and he should eat, there would be nothing gained. For it is not the eating that maketh unclean, but the intention with which a man eats. If then thou dost not set that aright, thou hast done all to no purpose, and hast made things worse: for thinking a thing unclean is not so bad as tasting it when one thinks it unclean. Here then you are committing two errors, one by increasing his prejudice through your quarrelsomeness, and another by getting him to taste of what is unclean. And so, as long as you do not persuade him, do not force him.