All this and more besides is set forth in the De mysteriis, the chief composition of his school. It was the answer to that doubting letter of Porphyry to Anebo, and contains full proof and exposition of the occult art of moving god or demon. We all have an inborn knowledge (ἔμφυτος γνῶσις)[43] of the gods. But it is not thought or contemplation that unites us to them; it is the power of the theurgic rite or cabalistic word, understood only by the gods. We cannot understand the reason of these acts and their effects.[44]
There is no lower depth. Plotinus’s reason-surpassing vision of the One (which represents in him the principle of irrationality) is at last brought down to the irrational act, the occult magic deed or word. Truly the worshipper needs his best credulity—which is bespoken by Iamblicus and by this book. The work seems to argue, somewhat obscurely, that the prayer or invocation or rite, does not actually draw the god to us, but draws us toward the god, making our wills fit to share in his. The writer of such a work is likely to be confused in his statement of principles; but will expand more genially when expounding the natures of demons, heroes, angels, and gods, and the effect of them upon humanity. Perhaps the matter still seems dark; but the picturesque details are bright enough. For the writer describes the manifestations and apparitions of these beings—their ἐπιφανείαι and φάσματα. The apparitions of the gods are μονοειδῆ, simple and uniform: those of the demons are ποικίλα, that is, various and manifold; those of the angels are more simple than those of the demons, but inferior to those of the gods. The archangels in their apparitions are more like the gods; while the ἄρχοντες, the “governors,” have variety and yet order. The gods as they appear to men, are radiant with divine effulgence, the archangels terrible yet kind; the demons are frightful, producing perturbation and terror—on all of which the work enlarges. Speaking more specifically of the effect of these apparitions on the thaumaturgist, the writer says that visions of the gods bring a mighty power, and divine love and joy ineffable; the archangels bring steadfastness and power of will and intellectual contemplation; the angels bring rational wisdom and truth and virtue. But the vision of demons brings the desires of sense and the vigour to fulfil them.
So low sank Neo-Platonism in pagan circles. Of course it did not create this mass of superstitious fantasy. It merely fell in cordially, and over every superstition flung the justification of its principles. In the process it changed from a philosophy to a system of theurgic practice. The common superstitions of the time, or their like, were old enough. But now—and here was the portentous fact—they had wound themselves into the natures of intellectual people; and Neo-Platonism represents the chief formal facilitation of this result.
A contemporary phenomenon, and perhaps the most popular of pagan cults in the third and fourth centuries, was the worship of Mithra, around which Neo-Platonism could throw its cloak as well as around any other form of pagan worship. Mithraism, a partially Hellenized growth from the old Mazdaean (even Indo-Iranian) faith, had been carried from one boundary of the Empire to the other, by soldiers or by merchants who had imbibed its doctrines in the East. It shot over the Empire like a flame. A warrior cult, the late pagan emperors gave it their adhesion. It was, in fine, the pagan Antaeus destined to succumb in the grasp of the Christian Hercules.
With it, or after it, came Manicheism, also from the East. This was quite as good a philosophy as the Neo-Platonism of Iamblicus. The system called after Manes was a crass dualism, containing fantastic and largely borrowed speculation as to the world and man. Satan was there and all his devils. He was the begetter of mankind, in Adam. But Satan himself, in previous struggles with good angels, had gained some elements of light; and these passed into Adam’s nature. Eve, however, is sensuality. After man’s engendering, the strife begins between the good and evil spirits to control his lot. In ethics, of course, Manicheism was dualistic and ascetic, like Neo-Platonism, and also like the Christianity of the Eastern and Western Empire. Manicheism, unlike Mithraism, was not to succumb, but merely to retreat before Christianity. Again and again from the East, through the lower confines of the present Russia, through Hungary, it made advance. The Bogomiles were its children; likewise the Cathari in the north of Italy, and the Albigenses of Provence.[45]
Platonism, Stoicism, Neo-Platonism, Mithraism, and Manicheism, these names, taken for simplicity’s sake, serve to indicate the mind and temper of the educated world in which Christianity was spreading. Obviously the Christian Fathers’ ways of thinking were given by all that made up their environment, their education, their second natures. They were men of their period, and as Christians their intellectual standards did not rise nor their understanding of fact alter, although their approvals and disapprovals might be changed. Their natures might be stimulated and uplifted by the Faith and its polemic ardours, and yet their manner of approaching and apprehending facts, its facts, for example, might continue substantially those of their pagan contemporaries or predecessors.
In the fourth century the leaders of the Church both in the East and West were greater men than contemporary pagan priests or philosophers or rhetoricians. For the strongest minds had enlisted on the Christian side, and a great cause inspired their highest energies with an efficient purpose. There is no comparison between Athanasius, Basil, Gregory Nazianzen, Gregory of Nyssa and Chrysostom in the East; Ambrose, Jerome, and Augustine in the West; and pagans, like Libanius, the favourite of the Emperor Julian, or even Julian himself, or Symmachus, the opponent of St. Ambrose in the cause of the pagan Altar of Victory. That was a lost cause, and the cause of paganism was becoming more and more broken, dissipated, uninspiring. Nevertheless, in spite of the superiority of the Christian doctors, in spite also of the mighty cause which marshalled their endeavours so efficiently, they present, both in their higher intelligence and their lower irrationalities, abundant likeness to the pagans.
It has appeared that metaphysical interests absorbed the attention of Plotinus, who has nevertheless his supreme irrationality atop of all. Porphyry also possessed a strong reasoning nature, but was drawn irresistibly to all the things, gods, demons, divination and theurgy, of which one half of him disapproved. Plotinus, quite in accordance with his philosophic principles, has an easy contempt for physical life. With Porphyry this has become ardent asceticism. It was also remarked that Plotinus’s system was a synthesis of much antecedent thought; and that its receptivity was rendered extremely elastic by the Neo-Platonic principle that man’s ultimate approach to God lay through ecstasy and not through reason. Herein, rather latent and not yet sorely taxed, was a broad justification of common beliefs and practices. To all these Iamblicus gladly opened the door. Rather than a philosopher, he was a priest, a thaumaturgist and magician. Finally, it is obvious that neither Iamblicus nor Porphyry nor Plotinus was primarily or even seriously interested in any clear objective knowledge of material facts. Plotinus merely noticed them casually in order to illustrate his principles, while Iamblicus looked to them for miracles.
Christianity as well as Neo-Platonism was an expression of the principle that life’s primordial reality is spirit. And likewise with Christians, as with Neo-Platonists, phases of irrationality may be observed in ascending and descending order. At the summit the sublimest Christian supra-rationality, the love of God, uplifts itself. From that height the irrational conviction grades down to credulity preoccupied with the demoniacal and miraculous. Fruitful comparisons may be drawn between Neo-Platonists and Christian doctors.[46]
Origen (died 253), like Plotinus, of Coptic descent, and the most brilliant genius of the Eastern Church, was by some fifteen years the senior of the Neo-Platonist. It is not certain that either of them directly influenced the other. In intellectual power the two were peers. Both were absorbed in the higher phases of their thought, but neither excluded the more popular beliefs from the system which he was occupied in constructing. Plotinus had no mind to shut the door against the beliefs of polytheism; and Origen accepted on his part the demons and angels of current Christian credence.[47] In fact, he occupied himself with them more than Plotinus did with the gods of the Hellenic pantheon. Of course Origen, like every other Christian doctor, had his fundamental and saving irrationality in his acceptance of the Christian revelation and the risen Christ. This had already taken its most drastic form in the credo quia absurdum of Tertullian the Latin Father, who was twenty-five years his senior. Herein one observes the acceptance of the miraculous on principle. That the great facts of the Christian creed were beyond the proof or disproof of reason was a principle definitely accepted by all the Fathers.