This later Neoplatonism aspired to be not only a complete and coherent metaphysical system but also a complete pagan theology, which is perhaps best seen in Proclus' Platonic Theology. The maintenance and defense of the old religion in a world more and more intolerantly dominated by its triumphant rival, Christianity, was one of the main concerns of the Platonists after Plotinus. By the study and sometimes forced exegesis of Aristotle and then Plato, culminating in the Timaeus and Parmenides, of which they offered a variety of highly metaphysical interpretations totally unacceptable to Plato scholars, they believed it possible to arrive at a complete understanding of divine truth. This truth they held to be cryptically revealed by the gods themselves through the so-called theologians--the inspired authors of the Orphic poems and of the Chaldean Oracles, published in the second half of the 2nd century AD. Porphyry first gave some guarded and qualified recognition to them, but they were inspired scripture to Iamblichus, who wrote a work of at least 28 books on the subject, and his successors. Their view of the human soul was a humbler one than that of Plotinus. It was for them a spiritual being of lower rank, which had descended altogether into the material world, while for Plotinus a part remained above; they could not therefore aspire, like Plotinus, through philosophy alone, to that return to and unification with the divine that remained for them the goal of human life. Help from the gods was needed, and they believed that the gods in their love for men had provided it, giving to all things the power of return in prayer and implanting even in inanimate material things--herbs and stones and the like--sympathies and communications with the divine, which made possible the secret rites of theurgy, through which the divine gave the needed spiritual help by material means. Theurgy, though its procedures were generally those of late Greek magic, was thus not thought of merely as magic; in fact a higher and more intellectual theurgy was also practiced. The degree of attention paid to external rites varied considerably from philosopher to philosopher; there seem to have been men even in the last generation of pagan Neoplatonists who had little use for or interest in such things and followed a mystical way much like that of Plotinus.
The different schools of late Neoplatonism seem to have differed less from each other than has sometimes been supposed. The school of Pergamum, founded by Aedesius, a pupil of Iamblichus, made perhaps the least contribution to the philosophical development of Neoplatonism, but it was not entirely given over to theurgy. Its greatest convert was the emperor Julian, called by Christians the "Apostate"; in that capacity he achieved great notoriety, but philosophically he is of no importance. By the end of the 4th century AD the Platonic Academy at Athens had been reestablished and had become an institute for Neoplatonic teaching and research following the tradition of Iamblichus. It was particularly fervent and open in its paganism and attracted Christian hostility. Though maintaining itself for a surprisingly long time against this hostility, it eventually yielded to it and was probably closed by Justinian in AD 529. In the interim, however, it had produced the greatest and most influential systematic expositor of later Neoplatonism, Proclus (see above). The head of the school at the time of its closing, Damascius, was also a notable philosopher. Another centre of Neoplatonism flourished at Gaza during the 5th and early 6th centuries; it was already Christian in its inspiration, though some of its members studied with the pagan Ammonius (see below). The school of Alexandria in the 5th and 6th centuries does not seem to have differed very much from that of Athens, either in its fundamental philosophical outlook or in the main outline of its doctrines. In fact there was much interchange between the two. The Athenian Syrianus taught the Alexandrian Hermias, whose son Ammonius was taught by Proclus. Ammonius (died c. 520) was the most influential of the Alexandrian Platonists. His expositions of Aristotle were published mainly in the commentaries of the Christian heretic John Philoponus (late 5th to mid-6th century). Simplicius, the other great Aristotelian commentator, worked at Athens but, like Damascius, had studied with Ammonius. The Alexandrian concentration on Aristotle, which produced a vast body of learned but Neoplatonically coloured commentary on his treatises, has often been attributed to Christian pressure and attempts to compromise with the church; it may equally well have been due to the quality and extent of Proclus' published work on Plato. Though Philoponus' later philosophical work contains important Christian modifications, an openly pagan (and very inferior) philosopher, Olympiodorus, was still teaching at Alexandria well into the second half of the 6th century. Finally, in the 7th century, under Heraclius, after philosophical teaching had passed peacefully into Christian hands, the last known Alexandrian philosopher, the Christian Stephanus, was called to teach in the University of Constantinople.
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