As Paul continues on in his letter about joy, he wants Christians to know that the joy they have should be manifested in their lives. They should “appear as lights in the world”. Like the old Sunday school song says, “I’ve got the joy, joy, joy, joy down in my heart. Where? Down in my heart; down in my heart.” But too often we may have joy but it is so far down in our hearts no one can see it. So let’s see what the apostle has to say to help Christians be lights of joy.