His interest in science.
But our particular interest is less in his political and more purely literary activities than in his taste for mathematics and science. He knew some medicine and was well acquainted with geometry and astronomy. He believed himself to be the inventor of an astrolabe and of a hydroscope.
Belief in occult sympathies between natural objects.
With this interest in natural and mathematical science went an interest in occult science and divination. His belief that the universe was a unit and all its parts closely correlated not only led him to maintain, like Seneca, that whatever had a cause was a sign of some future event, or to hold with Plotinus that in any and every object the sage might discern the future of every other, and that the birds themselves, if endowed with sufficient intelligence, would be able to predict the future by observing the movements of human bipeds.[2269] It led him also to the conclusion that the various parts of the universe were more than passive mirrors in which one might see the future of the other parts; that they further exerted, by virtue of the magic sympathy which united all parts of the universe, a potent active influence over other objects and occurrences. The wise man might not only predict the future; he might, to a great extent, control it. “For it must be, I think, that of this whole, so joined in sympathy and in agreement, the parts are closely connected as if members of a single body. And does not this explain the spells of the magi? For things, besides being signs of each other, have magic power over each other. The wise man, then, is he who knows the relationships of the parts of the universe. For he draws one object under his control by means of another object, holding what is at hand as a pledge for what is far away, and working through sounds and material substances and forms.”[2270] Synesius explained that plants and stones are related by bonds of occult sympathy to the gods who are within the universe and who form a part of it, that plants and stones have magic power over these gods, and that one may by means of such material substances attract those deities.[2271] He evidently believed that it was quite legitimate to control the processes of nature by invoking demons.
Synesius on divination and astrology.
The devotion of Synesius to divination has been already implied. He regarded it as among the noblest of human pursuits.[2272] Dreams, on which he wrote a treatise, he viewed as significant and very useful events. They aided him, he wrote, in his every-day life, and had upon one occasion saved him from magic devices against his life.[2273] Warned by a dream that he would have a son, he wrote a treatise for the child before it was born.[2274] Of course, he had faith in astrology. The stars were well-nigh ever present in his thought. In his Praise of Baldness he characterized comets as fatal omens, as harbingers of the worst public disasters.[2275] In On Providence he explained the supposed fact that history repeats itself by the periodical return to their former positions of the stars which govern our life.[2276] In On the Gift of an Astrolabe he declared that “astronomy” besides being itself a noble science, prepared men for the diviner mysteries of theology.[2277]
Synesius as an alchemist.
Finally, he held the view common among students of magic that knowledge should be esoteric; that its mysteries and marvels should be confined to the few fitted to receive them and that they should be expressed in language incomprehensible to the vulgar crowd.[2278] It is perhaps on this account that one of the oldest extant treatises of Greek alchemy is ascribed to him. Berthelot, however, accepted it as his, stating that “there is nothing surprising in Synesius’ having really written on alchemy.”[2279]
Macrobius on number, dreams, and stars.
Synesius influenced the Byzantine period but probably not the western medieval world. But the Commentary of Macrobius on The Dream of Scipio by Cicero is one of the treatises most frequently encountered in early medieval Latin manuscripts. In the twelfth century Abelard made frequent reference to Macrobius and called him “no mean philosopher”; in the thirteenth Aquinas cited him as an authority for the doctrines of Neo-Platonism.[2280] Macrobius himself affirmed that Vergil contained practically all necessary knowledge[2281] and that Cicero’s Dream of Scipio was a work second to none and contained the entire substance of philosophy.[2282] Macrobius believed that numbers possess occult power. He dilated at considerable length upon every number from one to eight, emphasizing the perfection and far-reaching significance of each. He held the Pythagorean doctrine that the world-soul consists of number, that number rules the harmony of the celestial bodies, and that from the music of the spheres we derive the numerical values proper to musical consonance.[2283] His opinion was that dreams and other striking occurrences will reveal an occult meaning to the careful investigator.[2284] As for astrology, he regarded the stars as signs but not causes of future events, just as birds by their flight or song reveal matters of which they themselves are ignorant.[2285] So the sun and other planets, though in a way divine, are but material bodies, and it is not from them but from the world-soul (pure mind), whence they too come, that the human spirit takes its origin.[2286] In his sole other extant work, the Saturnalia, Macrobius displays some belief in occult virtues in natural objects, as when Disaurius the physician answers such questions as why a copper knife stuck in game prevents decay.[2287]