On the other hand, as the field of practicable conquest again approaches exhaustion and no sufficiently strong rival arises to conquer the conquerors, nothing can hinder that people of all classes, having no ideals tending to social and intellectual advance, and no sufficient channel for the instinct of union in the politics of the autocracy, shall find some channels of a new kind.[62] These are opened in due course, and take the shape especially of religious combinations or churches. Such modes had appeared even in the earlier stages of civic disintegration, when the semi-private or sectarian cults had begun to compete successfully with the public or civic. They did so by appealing more freshly and directly to the growths of emotional feeling (the outcome in part of physiological modification)[63] which no longer found outlet in primary forms, such as warfare and primitive revelry. After having themselves consented in times of panic to the introduction of several cults in the name of the public interest, the ruling classes, instinctively conservative by the law of their existence, take fright at the startling popularity of the unofficial Bacchic mysteries, and decide to stamp out the movement.[64] But the attempt is futile, the causal conditions remaining; and soon Judaism, Osirianism, Mithraism, the worships of Attis, Adonis, Bacchus, Isis, Serapis, all more or less bound up with divination and sorcery, make way in the disintegrating body politic.[65] The wheel of social evolution had, so to speak, "gone full circle" since the first Roman _curia_, the basis of the State, subsisted as groups with their special _sacra_, finding in these their reason for cohering. Decadent Rome, all other principles of subordinate cohesion having been worked out, resolves itself once more into groups similarly motived. But the principle is newly conditioned, and the _sacra_ now begin the struggle for existence among themselves. The rise of Christianity is simply the success of a system which, on a good economic foundation, copied from that of the Jewish synagogues, assimilates the main attractions of similar worships, while availing itself of exoteric and democratic as well as esoteric methods. It thus necessarily gains ground among the multitude, rich as well as poor;[66] and its ultimate acceptance by the autocrat was due to the very exclusiveness which at first made it intolerable. Once diffused widely enough to set up the largest religious organisation in the Empire, it became the best possible instrument of centralisation and control, and as such it was accepted and employed.[67]