1 Corinthians 8:13

Wherefore, if meat make my brother to offend, I will eat no flesh while the world standeth, lest I make my brother to offend (KJV)

Then: Paul gives a personal statement, not a "you-ought-to" statement. The Corinthians using his example can follow him, as he previously told them to do, or they can continue in their own understandings of knowledge which allows for liberty in all things. The Corinthians now have the principle, the explanation, the potential consequences to the weak and to themselves, and Paul's example. It is their choice to make.

Now: We rarely think through our daily choices in terms of their effect on those watching. We should. Paul's teachings are eternal-life warnings.