To appreciate the labours of Plotinus, we must, first of all, compare his whole philosophic method with that of his predecessors. Now, Zeller himself has shown quite clearly that in reach of thought, in power of synthesis, in accuracy of reasoning, not one of these can be compared to the founder of Neo-Platonism for a single moment.[507] We may go still further and declare with confidence that no philosopher of equal speculative genius had appeared in Hellas since Chrysippus, or, very possibly, since Aristotle. The only ground for disputing his claims to take rank with the great masters of Hellenic thought seems to be that his system culminates on the objective side in something which lies beyond existence, and on the subjective side in a mystical ecstasy which is the negation of reason. We have shown, however, that if the One is represented as transcending reality, so also is the Idea of Good which corresponds to it in Plato’s scheme; and that the One is reached if not grasped by a process of reasoning which, although unsound, still offers itself as reasoning alone, and moves in complete independence of any revelation or intuition such as those to which the genuine systems of mysticism so freely resort.
It cannot be too often repeated that the One in no way conflicts with the world of real existence, but, on the contrary, creates and completes it. Now, within that world, with which alone reason is properly concerned, Plotinus never betrays any want of confidence in its power to discover truth; nor, contrary to what Zeller assumes, does he seem to have been in the least affected by the efforts of the later Sceptics to invalidate its pretensions in this respect.[508] Their criticism was, in fact, chiefly directed against Stoicism, and did not touch the spiritualistic position at all. That there can be no certain knowledge afforded by sensation, or, speaking more generally, by the action of an outward object on an inward subject, Plotinus himself fully admits or rather contends.[509] But while distrusting the ability of external perception, taken alone, to establish the existence of an external object by which it is caused, he expressly claims such a power for reason or understanding.[510] For him, as for Aristotle, and probably for Plato also, the mind is one with its real object; in every act of cognition the idea becomes conscious of itself. We do not say that Scepticism is powerless against such a theory as this, but, in point of fact, it was a theory which the ancient Sceptics had not attacked, and their arguments no more led Plotinus to despair of reason, than the similar arguments of Protagoras and Gorgias had led Plato and Aristotle to despair of it six centuries before. If Sextus and his school contributed anything to the great philosophical revolution of the succeeding age, it was by so weakening the materialistic systems as to render them less capable of opposing the spiritualistic revival when it came.
Unquestionably Plotinus was influenced by the supernaturalistic movement of his age, but only as Plato had been influenced by the similar reaction of his time; and just as the Athenian philosopher had protested against the superstitions which he saw gaining ground, so also did the Alexandrian philosopher protest, with far less vigour it is true, but still to some extent, against the worse extravagances universally entertained by his contemporaries. Among these, to judge by numerous allusions in his writings, astrology and magic held the foremost place. That there was something in both, he did not venture to deny, but he constantly endeavours to extenuate their practical significance and to give a more philosophical interpretation to the alleged phenomena on which they were based. Towards the old polytheism, his attitude, without being hostile, is perfectly independent. We can see this even in his life, notwithstanding the religious colouring thrown over it by Porphyry. When invited by his disciple Amelius to join in the public worship of the gods, he proudly answered, ‘It is their business to come to me, not mine to go to them.’[511] In allegorising the old myths, he handles them with as much freedom as Bacon, and evidently with no more belief in their historical character.[512] In giving the name of God to his supreme principle, he is careful to exclude nearly every attribute associated with divinity even in the purest forms of contemporary theology. Personality, intelligence, will, and even existence, are expressly denied to the One. Although the first cause and highest good of all things, it is so not in a religious but in an abstract, metaphysical sense. The Nous with its ideal offspring and the world-soul are also spoken of as gods; but their personality, if they have any, is of the most shadowy description, and there is no reason for thinking that Plotinus ever worshipped them himself or intended them to be worshipped by his disciples. Like Aristotle, he attributes animation and divinity to the heavenly bodies, but with such careful provisions against an anthropomorphic conception of their nature, that not much devotional feeling is likely to have mingled with the contemplation of their splendour. Finally, we arrive at the daemons, those intermediate spirits which play so great a part in the religion of Plutarch and the other Platonists of the second century. With regard to these, Plotinus repeats many of the current opinions as if he shared them; but his adhesion is of an extremely tepid character; and it may be doubted whether the daemons meant much more for him than for Plato.[513]
The immortality of the soul is a subject on which idealistic philosophers habitually express themselves in terms of apparently studied ambiguity, and this is especially true of Plotinus. Here, as elsewhere, he repeats the opinions and arguments of Plato, but with certain developments which make his adhesion to the popular belief in a personal duration after death considerably more doubtful than was that of his master. One great difficulty in the way of Plato’s doctrine, as commonly understood, is that it attributes a permanence to individuals, which, on the principles of his system, should belong only to general ideas. Now, at first sight, Plotinus seems to evade this difficulty by admitting everlasting ideas of individuals no less than of generic types.[514] A closer examination, however, shows that this view is even more unfavourable than Plato’s to the hope of personal immortality. For either our real self is independent of our empirical consciousness, which is just what we wish to have preserved, or, as seems more probable, the eternal existence which it enjoys is of an altogether ideal character, like that which Spinoza also attributed to the human soul, and which, in his philosophy, certainly had nothing to do with a prolongation of individual consciousness beyond the grave. As Madame de Staël observes of a similar view held at one time by Schelling, ‘cette immortalité-là ressemble terriblement à la mort.’ And when, in addition to his own theory of individual ideas, we find Plotinus adopting the theory of the Stoics, that the whole course of mundane affairs periodically returns to its starting-point and is repeated in the same order as before,[515] we cannot help concluding that human immortality in the popular sense must have seemed as impossible to him as it did to them. We must, therefore, suppose that the doctrine of metempsychosis and future retributions which he unquestionably professes, applies only to certain determinate cycles of psychic life; or that it was to him, what it had probably been to Plato, only a figurative way of expressing the essential unity of all souls, and the transcendent character of ethical distinctions.[516]
In this connexion we may deal with the question whether the philosophy of Plotinus is properly described as a pantheistic system. Plotinus was certainly not a pantheist in the same sense as Spinoza and Hegel. With him, the One and the All are not identical; although impersonal and unconscious, his supreme principle is not immanent in the universe, but transcends and creates it: the totality of things are dependent on it, but it is independent of them. Even were we to assume that the One is only ideally distinct from the existence which it causes, still the Nous would remain separate from the world-soul, the higher Soul from Nature, and, within the sphere of Nature herself, Matter would continue to be perpetually breaking away from Form, free-will would be left in unreconciled hostility to fate. Once, and once only, if we remember rightly, does our philosopher rise to the modern conception of the universe as an absolute whole whose parts are not caused but constituted by their fundamental unity, and are not really separated from one another in Nature, but only ideally distinguished in our thoughts. And he adds that we cannot keep up this effort of abstraction for long at a time; things escape from us, and return to their original unity.[517] With Plotinus himself, however, the contrary was true: what he could not keep up was his grasp on the synthetic unity of things. And he himself supplies us with a ready explanation why it should be so, when he points to the dividing tendency of thought as opposed to the uniting tendency of Nature. What he and the other Hellenic thinkers wanted above all, was to make the world clear to themselves and to their pupils, and this they accomplished by their method of serial classification, by bringing into play what we have often spoken of as the moments of antithesis, mediation, and circumscription, Stoicism also had just touched the pantheistic idea, only to let it go again. After being nominally identified with the world, the Stoic God was represented as a designing intelligence, like the Socratic God—an idea wholly alien from real pantheism.
If Plotinus rose above the vulgar superstitions of the West, while, at the same time, using their language for the easier expression of his philosophical ideas, there was one more refined superstition of mixed Greek and Oriental origin which he denounced with the most uncompromising vigour. This was Gnosticism, as taught by Valentinus and his school. Towards the close of our last chapter, we gave some account of the theory in question. It was principally as enemies of the world and maligners of its perfection that the Gnostics made themselves offensive to the founder of Neo-Platonism. To him, the antithesis of good and evil was represented, not by the opposition of spirit and Nature, but by the opposition between his ideal principle through all degrees of its perfection, and unformed Matter. Like Plato, he looked on the existing world as a consummate work of art, an embodiment of the archetypal Ideas, a visible presentation of reason. But in the course of his attack on the Gnostics,[518] other points of great interest are raised, showing how profoundly his philosophy differed from theirs, how entirely he takes his stand on the fixed principles of Hellenic thought. Thus he particularly reproaches his opponents for their systematic disparagement of Plato, to whom, after all, they owe whatever is true and valuable in their metaphysics.[519] He ridicules their belief in demoniacal possession, with its wholly gratuitous and clumsy employment of supernatural agencies to account for what can be sufficiently explained by the operation of natural causes.[520] And, more than anything else, he severely censures their detachment of religion from morality. On this last point, some of his remarks are so striking and pertinent that they deserve to be quoted.
Above all, he exclaims, we must not fail to notice what effect this doctrine has on the minds of those whom they have persuaded to despise the world and all that it contains. Of the two chief methods for attaining the supreme good, one has sensual pleasure for its end, the other virtue, the effort after which begins and ends with God. Epicurus, by his denial of providence, leaves us no choice but to pursue the former. But this doctrine [Gnosticism], involving as it does a still more insolent denial of divine order and human law, laughs to scorn what has always been the accepted ideal of conduct, and, in its rage against beauty, abolishes temperance and justice—the justice that is associated with natural feeling and perpetuated by discipline and reason—along with every other ennobling virtue. So, in the absence of true morality, they are given over to pleasure and utility and selfish isolation from other men—unless, indeed, their nature is better than their principles. They have an ideal that nothing here below can satisfy, and so they put off the effort for its attainment to a future life, whereas they should begin at once, and prove that they are of divine race by fulfilling the duties of their present state. For virtue is the condition of every higher aspiration, and only to those who disdain sensual enjoyment is it given to understand the divine. How far our opponents are from realising this is proved by their total neglect of ethical science. They neither know what virtue is, nor how many virtues there are, nor what ancient philosophy has to teach us on the subject, nor what are the methods of moral training, nor how the soul is to be tended and cleansed. They tell us to look to God; but merely saying this is useless unless they can tell us what the manner of the looking is to be. For it might be asked, what is to prevent us from looking to God, while at the same time freely indulging our sensual appetites and angry passions. Virtue perfected, enlightened, and rooted in the soul, will reveal God to us, but without it he will remain an empty name.[521]
Even M. Vacherot, with all his anxiety to discover an Oriental origin for Neo-Platonism, cannot help seeing that this attack on the Gnostics was inspired by an indignant reaction of Greek philosophy against the inroads of Oriental superstition, and that the same character belongs more or less to the whole system of its author. But, so far as we are aware, Kirchner is the only critic who has fully worked out this idea, and exhibited the philosophy of Plotinus in its true character as a part of the great classical revival, which after producing the literature of the second century reached its consummation in a return to the idealism of Plato and Aristotle.[522]
Neo-Platonism may itself furnish us with no inapt image of the age in which it arose. Like the unformed Matter about which we have been hearing so much, the consciousness of that period was in itself dark, indeterminate and unsteady, uncreative, unspontaneous, unoriginating, but with a receptive capacity which enabled it to seize, reflect, and transmit the power of living Reason, the splendour of eternal thought.