Besides peopling the invisible world with beneficent ancestral spirits, the Chinese have filled heaven and earth with innumerable demons or evil spirits. Even the souls of dead men, if they have been wronged on earth or if their wants since death have been undutifully neglected, may become malignant, revengeful spirits. These demons are believed to be the cause of all kinds of diseases, of blight and famine, and of every misfortune befalling men.[122] The thing about this Chinese demonism which is of interest to the student of morals is that, unlike the demonism of Babylonia (p. 46), or that of the Middle Ages in Europe, it contains a distinct ethical element. There was little or nothing ethical in the Babylonian or the medieval belief in the existence of evil spirits because the good man and the bad were indifferently the victims of their malignant activity. But the Chinese have moralized their demonism and conceive these spirits as under the control of Heaven and without power to do harm without Heaven’s commission or consent. They thus represent retributive justice and become the ministers of the Supreme Power to punish evildoers, like Nemesis and the Erinyes of the Greeks. It is this ethical side of the Chinese belief in evil spirits which causes De Groot, in emphasizing the import of this demonism for Chinese morality, to say that “it occupies the rank of moral educator of the people, and has fulfilled a great mission to many thousands of millions who have lived and died on Asiatic soil. Demonism, the lowest form of religion, in China a source of ethics and moral education--this certainly may be called a singular phenomenon, perhaps the only one of its kind to be found on this terrestrial globe.” [123] [Sidenote: Taoism: nature the exemplar] Next to Confucianism and demonism, Taoism has been the most important moral force in the life of the Chinese people. Taoism was originally a lofty philosophical ethical system out of which was developed later a religion.[124] The philosophy, however, has always remained something quite distinct from the religious system. The essence of Taoism is the pantheistic doctrine that the universe, or nature, is God. The ethical character of the universe is revealed in its way or method, which is _Tao_. Now the characteristics of nature as disclosed in its method of operation are constancy--“heaven never diverges from its course”; unselfishness--“the earth nourishes all things”; impartiality--“the earth brings forth its fruits for all alike”; placidity--“heaven is calm, serene, passionless”; humility--the sun which “after shining sets,” the moon which “after fullness, wanes,” the warmth of summer which “when it has finished its work retires,” water which “seeks the lowest place,” all these are symbols of “nature’s humility.”[125]