1 Corinthians 8: 1 - 7, 11 - 13
1 Now concerning food offered to idols: we know that "all of us possess knowledge." "Knowledge" puffs up, but love builds up.
2 If any one imagines that he knows something, he does not yet know as he ought to know.
3 But if one loves God, one is known by him.
4 Hence, as to the eating of food offered to idols, we know that "an idol has no real existence," and that "there is no God but one."
5 For although there may be so-called gods in heaven or on earth -- as indeed there are many "gods" and many "lords" --
6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.
7 However, not all possess this knowledge. But some, through being hitherto accustomed to idols, eat food as really offered to an idol; and their conscience, being weak, is defiled.
11 And so by your knowledge this weak man is destroyed, the brother for whom Christ died.
12 Thus, sinning against your brethren and wounding their conscience when it is weak, you sin against Christ.
13 Therefore, if food is a cause of my brother's falling, I will never eat meat, lest I cause my brother to fall.

EWTN