William Burkitt on 1 Corinthians 10:23

Our apostle having in the former part of this chapter resolved the case concerning public eating things offered unto idols in the idol-temples, and by several arguments proved it to be absolutely unlawful; he comes now to resolve another case, concerning private buying and private eating of things offered unto idols; for it seems to have been a custom to set to sale in the market, flesh that was sacrificed, (the gain whereof went to the priests,) as well as other flesh; but first he answers an objection.

Some might be ready to say, all things are lawful for me; that is, all meats may be lawfully eaten by me. If so, says the apostle, yet all lawful things are not expedient to be done in respect of our weak brother; plainly intimating, that there are many things lawful in themselves, which, considered under such and such circumstances, are very inexpedient: so far are they unlawful.