Without a system of rewards and punishments, society crumbles and non believers do not become or try to be good. When a man wrongs you, he must be punished. When he does right to you, he must be rewarded. Without this system, society is unlivable. It is unbearable, for when even believers are at times drawn to obedience by bit and bridle, how much more severity is needed for non believers not to ruin the lives of all!