Charles Ellicott Commentary 1 Corinthians 8:9

"But take heed lest by any means this liberty of yours become a stumblingblock to the weak." — 1 Corinthians 8:9 (ASV)

But take heed.—For this very reason, because the matter is indifferent, because there is no right or wrong in it, you must look elsewhere for your guide on how you should act. In things that are not indifferent, right or wrong is the sole test of action. In indifferent matters, you must look for some other guide, and you must regulate your conduct by the effect it may have on others. Your liberty, which arises from the bare fact of the indifferent nature of the thing, may become a stumbling block to others, may cause them to take a false step in their Christian course.