In regard to idols, there is a knowledge that puffs man up. True knowledge comes from God and edifies to give discernment in this world of departure from God.
We have one God and Father and one Lord Jesus Christ. Not all men have this knowledge, for some offer to idols. There is a demon behind every idol. What we do might be a stumbling to souls. If one had worshiped idols all of his life and suddenly found Christ, he might through lack of teaching still worship idols. We should be careful not to eat what is offered to idols, although we have knowledge.