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.
"For the entire Law is fulfilled in in this one word: "You shall love your neighbor as yourself."—Gal 5:14