'Matters' in the Bible

As for brotherly love, be affectionate to one another; in matters of worldly honour, yield to one another.

I now pass to another subject. Receive as a friend a man whose faith is weak, but not for the purpose of deciding mere matters of opinion.

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.