'Convictions' in the Bible

The faith which you have [that gives you freedom of choice], have as your own conviction before God [just keep it between yourself and God, seeking His will]. Happy is he who has no reason to condemn himself for what he approves.

But he who is uncertain [about eating a particular thing] is condemned if he eats, because he is not acting from faith. Whatever is not from faith is sin [whatever is done with doubt is sinful].

Now we who are strong [in our convictions and faith] ought to [patiently] put up with the weaknesses of those who are not strong, and not just please ourselves.