Settling differences.
Ever had a brother or sister in Christ who you just KNOW ain't livin' up to expectations? Time to give 'em an earful! Especially if it's affronted you!
Galatians 6:1 says, "Brothers, if anyone is caught in any transgression, you who are spiritual should restore him in a spirit of gentleness. Keep watch on yourself, lest you too be tempted."
Our goal must not be punishment, but restoration, and not with the fierce wrath of a volcano, but rather in gentleness. I lack this, but I'm getting better daily. One last thing: that brother or sister out indulging in the world...is caught in something very, very addictive. Be very careful lest you get caught up in the same sin.