If Posidonius has largely borrowed these ideas from the platonising Pythagorism of his period, he forsook this philosophy on an essential point. As a Stoic he did not admit the transcendency of God. For him, God was immanent in the universe; the seat of the directing reason of the world (ἡγεμονικόν) was the sphere of the fixed stars, which embraced all other spheres and determined their revolutions. There too, at the summit of the world but not outside it, the spirits of the blessed gathered; from these high peaks they delighted to observe earthly happenings; and when a pious soul tried to rise to them, these succouring heroes, like our saints, could lend their aid and protection.
This philosophy did not draw its power of persuasion only from its logical consistency, which satisfied reason, but it also made a strong appeal to feeling. Posidonius caused a broad stream of mystical ideas, undoubtedly derived from the beliefs developed by the astral religions of the East, to flow into the arid bed of a Stoicism which had become scholastic. For him, reason was not enclosed in the body, even when it sojourned here below; it escaped from it to pass with marvellous swiftness from the depths of the sea to the ends of the earth and the top of the heavens; it flew through all nature, learning to know physical laws and to admire the divine order ever more and more. Above all it could never weary of the sight of the glowing constellations and their harmonious movements. It felt with emotion, as it gave itself up to contemplating them, its kinship with the celestial fires; it entered into communion with the higher gods. In enthusiastic terms, echoed by his imitators, Posidonius described the ecstasy which seized him who left the earth, who felt himself transported to the midst of the sacred chorus of the stars and who followed their rhythmic evolutions. In these transports, the soul did not only win to infinite power, but also received from heaven the revelation of the nature and cause of the celestial revolutions. Thus even in this life it had a foretaste of the beatitude which would belong to it after death when reason, rid of the weak organs of the senses, would directly perceive all the splendours of the divine world and would know its mysteries completely.[[83]]
This theology attributed to man a power such as to satisfy his proudest feelings. It did not regard him as a tiny animalcule who had appeared on a small planet lost in immensity, nor did it, when he scrutinised the heavens, crush him with a sense of his own pettiness as compared with bodies whose greatness surpassed the limits of his imagination. It made man king of creation, placed him in the centre of a still limited world of which the proportions were not so vast that he could not travel all over his domain. If he could tear himself from the domination of his body, he became capable of communicating with the visible gods who were almost within his reach and whom he might hope to equal after his passage here below. He knew himself to be united to them by an identity of nature which alone explained how he understood them.
“Quis caelum possit, nisi caeli munere, nosse
Et reperire deum, nisi qui pars ipse Dei est?”[[84]]
“Who could know heaven save by heavenly grace, or find God if he were not himself a part of God?”—words of the Roman poet who echoes Posidonius’ teaching.
It is easy to understand that such ideas were readily adopted at a time when human minds, tired of inconclusive disputes, despaired of ever reaching truth by their own strength. The astral mysticism eloquently preached by Posidonius was to influence all the later Stoicism. Seneca in particular, in the numerous passages in which he speaks of the misery and baseness of life in the body and celebrates the felicity of the pure souls who live among the stars, shows the imprint of the philosopher of Apamea. And this philosopher also exerted a far-reaching action beyond the narrow circle of the school. The erudition of the antiquarian Varro, the poems of Virgil and Manilius and the biblical exegesis of Philo the Jew, all drew on him for inspiration. But the author in whom we can best discern his influence is his pupil Cicero, the abundance of whose writings allows us to follow the evolution of his thought, which is characteristic of the whole society of his time.
It is beyond doubt that Cicero was an agnostic for the greater part of his life. His mind found satisfaction in the scepticism of the New Academy, or rather he adopted towards the future life the received attitude of the world in which he lived, where the problem of the soul’s origin and destiny was regarded as not only insoluble but also idle, as unworthy to absorb the minds of men who should devote their energies to the service of the state. The question of the cult to be rendered to the Manes had been settled once for all by the ancient pontifical law. Old Rome distrusted speculations as to the Beyond because they dangerously diverted thought from actual realities. But Cicero, by his study of the writings of his master Posidonius and by his intercourse with the senator Nigidius Figulus, a fervent adept of Pythagorism,[[85]] had been brought into contact with the stream of mystical ideas which was beginning to flow through the West. Gradually, as he grew older and life brought him disappointments, his thought was more attracted to religious ideas.[[86]] In 54, when he had given up political life, he composed the Republic, an imitation of Plato’s work on the same subject. As Plato had introduced the myth of Er the Armenian at the end of his work, so his Roman imitator concludes with the puzzling picture of “Scipio’s Dream,” where the destroyer of Carthage receives the revelations of the conqueror of Zama. The hero, from the height of the celestial spheres, expounds that doctrine of astral immortality which was common to the Pythagoreans and to Posidonius. It is given as yet only as a dream, a vision the truth of which is in no way guaranteed. But in 45 B. C. Cicero suffered a cruel loss in the death of his only daughter Tullia. His grief persuaded him that this beloved being still lived among the gods. Even while he accused himself of unreasonable weakness, he ordered that not a tomb but a chapel (fanum), consecrating her apotheosis, should be raised to this young woman. The letters he wrote at this time to Atticus, from the shores of the Pomptine Marshes, in the solitude of Astura, apprise us of his most intimate feelings. He gave vent to his sorrow in writing a Consolatio, and in its preserved fragments we see him strangely impressed by the Pythagorean doctrines: he speaks of the soul, exempt from all matter, as celestial and divine and therefore eternal, of the soul’s life here below as a penalty inflicted on it because it is born to expiate anterior crimes (scelerum luendorum causa).
Cicero’s sensitive spirit, troubled by the perplexing problem of our destiny, did not turn to the old discredited beliefs but to the new conceptions which a mystical philosophy had brought from the East. Hortensius and the Tusculans, written in this period of his life, show us the empire which the Neo-Stoicism of his master and the Neo-Pythagorism of his fellow-senator then exercised over his mind, saddened and disillusioned as he was, and show us too how he sought consolation for the private and public ills which were overwhelming him in the luminous doctrine of a blissful survival.