The ancients cloud: bronze as mirrors, can is clothes; In the ancient for lens, can know for xing; YiRenWeiJing, can the gain and loss, mount for lens, can gauge behavior. Law as a "national rules degree", is a kind of the objective rational reflect the entity, as a measure of human behavior tool, is not possible with emotional. So, the law is the embodiment of equity and justice, his rational, mandatory, seriousness and universality are embodies the "legal ruthless".