Read C.S. Lewis Mere Christianity. Lewis eloquently introduces what has been called a "God-shaped hole" in the human spirit. Or as St Augustine put it “Thou hast made us for thyself, O Lord, and our heart is restless until it finds its rest in thee.” Augustine knows of what he speaks - he was a world-class playboy until his thirties, at which point he understood peace is not found in the pursuit of worldly pleasures.