Romans 14:20

Overthrow not for meat's sake the work of God. All things indeed are clean; howbeit it is evil for that man who eateth with offense.

Romans 14:14-15 carry exactly this same admonition, which is repeated here for emphasis. Even if a Christian may conscientiously do certain things (eating meat is here only an example), he should avoid doing so under any circumstance that might jeopardize the conscience of others. A parallel case is seen in Paul's word to Corinth:

If one of them that believeth not biddeth you to a feast, and ye are disposed to go; whatsoever is set before you, eat, asking no questions for conscience' sake. But if any man say unto you, This hath been offered in sacrifice, eat not, for his sake that showed it, and for conscience' sake: conscience, I say, not thine own, but the other's (1 Corinthians 10:27-29).