As we draw closer to God, our conviction in his righteous standards is strengthened. But regarding other matters, Proverbs 21:20 has this reminder:

"All of a man's ways seem right to him."

This proverb can help us to be humble, and not opinionated. IThis includes when we don't have all the facts, or in matters of opinion where our viewpoint differs from another Christian's.

Humility helps us remain respectful -towards Christians and nonchristians alike- and can quell any tendency we may have to be self-righteous, unreasonable, or contentious. Additionally, it can help us continue to look at our brother positively remembering that both parties are imperfect people doing their best, and can motivate us to avoid stumbling him.