That the greatest religious change in the history of mankind should have taken place under the eyes of a brilliant galaxy of philosophers and historians, who were profoundly conscious of the decomposition around them, that all of these writers should have utterly failed to predict the issue of the movement they were observing, and that, during the space of three centuries, they should have treated as simply contemptible an agency which all men must now admit to have been, for good or for evil, the most powerful moral lever that has ever been applied to the affairs of man, are facts well worthy of meditation in every period of religious transition. The explanation is to be found in that broad separation between the spheres of morals and of positive religion we have considered in the last chapter. In modern times, men who were examining the probable moral future of the world, would naturally, and in the first place, direct their attention to the relative positions and the probable destinies of religious institutions. In the Stoical period of the Roman Empire, positive religion had come to be regarded as merely an art for obtaining preternatural assistance in the affairs of life, and the moral amelioration of mankind was deemed altogether external to its sphere. Philosophy had become to the educated most literally a religion. It was the rule of life, the exposition of the Divine nature, the source of devotional feeling. The numerous Oriental superstitions that had deluged the city were regarded as peculiarly pernicious and contemptible, and of these none was less likely to attract the favour of the philosophers than that of the Jews,(635) who were notorious as the most sordid, the most turbulent,(636) and the most unsocial(637) of the Oriental colonists. Of the ignorance of their tenets, displayed even by the most eminent Romans, we have a striking illustration in the long series of grotesque fables concerning their belief, probably derived from some satirical pamphlet, which Tacitus has gravely inserted in his history.(638) Christianity, in the eyes of the philosopher, was simply a sect of Judaism.