The second step in the development of religious beliefs, undoubtedly the most difficult next to the establishment of a separate divine world, was precisely this transition from polytheism to monotheism, from the religious materialism of the pagans to the spiritualistic faith of the Christians. The pagan gods--and this was their principal characteristic--were first of all exclusively national gods. Very numerous, they necessarily retained a more or less material character, or, rather, they were so numerous because they were material, diversity being one of the principal attributes of the real world. The pagan gods were not yet strictly the negation of real things; they were only a fantastic exaggeration of them. We have seen how much this transition cost the Jewish people, constituting, so to speak, its entire history. In vain did Moses and the prophets preach the one god; the people always relapsed into their primitive idolatry, into the ancient and comparatively much more natural and convenient faith in many good gods, more material, more human, and more palpable. Jehovah himself, their sole God, the God of Moses and the prophets, was still an extremely national God, who, to reward and punish his faithful followers, his chosen people, used material arguments, often stupid, always gross and cruel. It does not even appear that faith in his existence implied a negation of the existence of earlier gods. The Jewish God did not deny the existence of these rivals; he simply did not want his people to worship them side by side with him, because before all Jehovah was a very jealous God. His first commandment was this: "I am the Lord thy God, and thou shalt have no other gods before me." Jehovah, then, was only a first draft, very material and very rough, of the supreme deity of modern idealism. Moreover, he was only a national God, like the Russian God worshipped by the German generals, subjects of the Czar and patriots of the empire of all the Russias; like the German God, whom the pietists and the German generals, subjects of William I. at Berlin, will no doubt soon proclaim. The supreme being cannot be a national God; he must be the God of entire Humanity. Nor can the supreme being be a material being; he must be the negation of all matter--pure spirit. Two things have proved necessary to the realization of the worship of the supreme being: (1) a realization, such as it is, of Humanity by the negation of nationalities and national forms of worship; (2) a development, already far advanced, of metaphysical ideas in order to spiritualize the gross Jehovah of the Jews. The first condition was fulfilled by the Romans, though in a very negative way no doubt, by the conquest of most of the countries known to the ancients and by the destruction of their national institutions. The gods of all the conquered nations, gathered in the Pantheon, mutually cancelled each other. This was the first draft of humanity, very gross and quite negative.