Do you remember when you were a little kid and you didn’t care what you looked like, smelled like, or if the boys (if you’re a girl) or if the girls (if you’re a boy) even knew you existed? You were a happy kid. You did not fear bad grades, family problems, or Middle East war. You were happy! Why does laughter often leave when the teenage years come? If any person deserved to be sad (or even mad), it was Paul. He was beaten and left for dead, thrown in prison, shipwrecked, snake-bitten, and soldier-whipped. But he kept rejoicing in the Lord. How? Paul gave the young Philippian believers four life-changing, joy-producing principles that kept joy in his heart and a smile on his face.