After its temporary adoption by the Academy, Pythagoreanism had ceased to exist as an independent system, but continued to lead a sort of underground life in connexion with the Orphic and Dionysiac mysteries. When or where it reappeared under a philosophical form cannot be certainly determined. Zeller fixes on the beginning of the first century B.C. as the most probable date, and on Alexandria as the most probable scene of its renewed speculative activity.[385] Some fifty years later, we find Pythagorean teachers in Rome, and traces of their influence are plainly discernible in the Augustan literature. Under its earliest form, the new system was an attempt to combine mathematical mysticism with principles borrowed from the Stoic and other philosophies; or perhaps it was simply a return to the poetical syncretism of Empedocles. Although composed of fire and air, the soul is declared to be immortal; and lessons of holiness are accompanied by an elaborate code of rules for ceremonial purification. The elder Sextius, from whom Seneca derived much of his ethical enthusiasm, probably belonged to this school. He taught a morality apparently identical with that of Stoicism in every point except the inculcation of abstinence from animal food.[386] To this might be added the practice of nightly self-confession—an examination from the moral point of view of how one’s whole day has been spent,—were we certain that the Stoics did not originate it for themselves.[387] The alliance between Neo-Pythagoreanism and Stoicism did not last long. Their fundamental principles were too radically opposed to admit of any reconciliation, except what could be effected by the absorption of both into a more comprehensive system. And Roman Stoicism, at least, was too practical, too scientific, too sane, to assimilate what must have seemed a curious amalgam of mathematical jugglery and dreamy asceticism; while the reputation of belonging to what passed for a secret society would be regarded with particular dread in the vicinity of the imperial court,—it was, in fact, for this particular reason that the elder Seneca persuaded his son to renounce the vegetarian diet which Sotion had induced him to adopt,—and the suspicious hostility of the public authorities may have had something to do with the speedy disappearance of Neo-Pythagoreanism from Rome.[388] On the other hand, so coarsely materialistic and utilitarian a doctrine as that of the Porch, must have been equally repulsive to the spiritualism which, while it discerned a deep kinship permeating all forms of animal existence, saw in the outward conditions of that existence only the prison or the tomb where a heaven-born exile lay immured in expiation of the guilt that had driven him from his former and well-nigh forgotten abode. Hence, after Seneca, we find the two schools pursuing divergent directions, the naturalism of the one becoming more and more contrasted with the spiritualism of the other. It has been mentioned