In Eph. 5:11-12, Paul warns the children of light: Do not participate in the unfruitful works of darkness. Beside avoiding participation, we must actively expose the darkness. Denny Petrillo writes, Now the Christian need to help the world see things like God sees them. And along revealing their true character, one will show the consequences of these deeds.”
Light Exposes the Sin of Unbelievers (Eph. 5:11-13) Since we are in the world but not of the world (1 John 2:15-17) we must not avoid contact with people. What it means is that we must live a holy life (Rom. 12:1-2) while confronting darkness. Jude says that we are to contend earnestly for the faith once for all delivered to the saints.
Light Transforms Unbelievers Into the Realm of Light (Eph. 5:14)