Among a host of animals, why are only human beings reasonable? Because human beings have a treasure that other animals do not have, which is called sympathy. Sympathy is to make allowances for others with one's own heart. All mortals and civilization in the world begin with this. 许多动物中，何以只有人讲道理呢？是为了人具有别的动物所没有的一件宝贝，这宝贝名叫“同情”。同情就是用自己的心来推谅别人的心。人间一切道德，一切文明，皆从这点出发。