Have no fellowship with the unfruitful works of darkness, but rather expose them.
Rather than doing what people in the world do, we ought to be exposing their evil. You could call us the spiritual CIA: our job is to expose the crimes of darkness. Our tool is the Word of God: “All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness. (2 Tim. 3:16, NASB; emphasis added). Our life and our words should expose evil.
Sometimes just the way you live can expose the evil in people’s lives. Have you ever walked up to people who know you’re a Christian and who happen to be in the middle of a filthy conversation? Does it suddenly turn clean? When some unbelievers I happened to be playing golf with found out I was a pastor, their words and attitudes changed immediately.
We also are commissioned by God to verbally expose the evil of the world. We must diagnose it, confront it, and then offer the solution. Sin is a cancer that must be removed. You aren’t helping anyone by ignoring it. People need to be convicted about their sin before they will ever see their need for a Savior.
~ John MacArthur ~