In New Platonism, the ancient mind made its last and almost despairing attempt at a philosophy which should resolve the dualism between the subjective and the objective. The attempt was made by taking on the one side a subjective standpoint, like the other philosophies of the post-Aristotelian time (cf. § XVI 7); and on the other with the design to bring out objective determinations concerning the highest conceptions of metaphysics, and concerning the absolute; in other words, to sketch a system of absolute philosophy. In this respect the effort was made to copy the Platonic and Aristotelian philosophy, and the claim was set up by the new system to be a revival of the original Platonism. On both sides the new attempt formed the closing period of an ancient philosophy. It represents the last struggle, but at the same time the exhaustion of the ancient thinking and the dissolution of the old philosophy.

The first, and also the most important, representative of New Platonism, is Plotinus. He was a pupil of Ammonius Saccas, who taught the Platonic philosophy at Alexandria in the beginning of the third century, though he left no writings behind him. Plotinus (A. D. 205-270) from his fortieth year taught philosophy at Rome. His opinions are contained in a course of hastily written and not closely connected treatises, which, after his death, were collected and published in six enneads by Porphyry (who was born A. D. 233, and taught both philosophy and eloquence at Rome), his most noted disciple. From Rome and Alexandria, the New Platonism of Plotinus passed over in the fourth century to Athens, where it established itself in the Academy. In the fourth century, Jamblichus, a scholar of Porphyry, and in the fifth, Proclus, (412-485), were prominently distinguished among the New Platonists. With the triumph of Christianity and the consequent fall of heathenism, in the course of the sixth century, even this last bloom of Grecian philosophy faded away.

The common characteristic of all the New Platonists is a tendency to mysticism, theosophy, and theurgy. The majority of them gave themselves up to magic and sorcery, and the most distinguished boasted that they were the subjects of divine inspiration and illumination, able to look into the future, and to work miracles. They professed to be hierophants as much as philosophers, and exhibited the unmistakable tendency to represent a Pagan copy of Christianity, which should be at the same time a philosophy and a universal religion. In the following sketch of New Platonism we follow mainly the track of Plotinus.

1. Ecstasy as a Subjective state.—The result of the philosophical strivings antecedent to New Platonism had been Scepticism; which, seeing the impracticability of both the Stoic and Epicurean wisdom, had assumed a totally negative relation to every positive and theoretical content. But the end which Scepticism had actually gained was the opposite of that for which it had striven. It had striven for the perfect apathy of the sage, but it had gained only the necessity of incessantly opposing every positive affirmation. Instead of the rest which they had sought, they found rather an absolute unrest. This absolute unrest of the consciousness striving after an absolute rest, begat immediately a longing to be freed from this unrest, a longing after some content which should be absolutely satisfying, and stripped of every sceptical objection. This longing after an absolutely true, found its historical expression in New Platonism. The subject sought to master and comprehend the absolute; and this, neither by objective knowledge nor dialectic mediation, but immediately, by an inner and mystical mounting up of the subject in the form of an immediate beholding, or ecstasy. The knowledge of the true, says Plotinus, is not gained by proof nor by any mediation; it cannot be found when the objects known remain separate from the subject knowing, but only when the distinction between knower and known disappears; it is a beholding of the reason in itself, not in the sense that we see the reason, but the reason beholds itself; in no other way can knowledge come. If any one has attained to such a beholding, to such a true unison with the divine, he will despise the pure thinking which he otherwise loved, for this thinking was only a movement which presupposed a difference between the perceiver and the perceived. This mystical absorption into the Deity, or, the One, this resolving the self into the absolute, is that which gives to New Platonism a character so peculiarly distinct from the genuine Grecian systems of philosophy.

2. The Cosmical Principles.—The doctrine of the three cosmical principles is most closely connected with the theory just named. To the two cosmical principles already received, viz., the world-soul and the world-reason, a third and higher one was added by the New Platonists. For if the reason apprehends the true by means of thinking, and not within itself alone; if, in order to grasp the absolute and behold the divine, it must lose its own self-consciousness, and go out beyond itself, then reason cannot be the highest principle, but there stands above it that primal essence, with which it must be united if it will behold the true. To this primal essence Plotinus gives different names, as “the first,” “the one,” “the good,” and “that which stands above being” (being is with him but a conception, which, like the reason, may be resolved into a higher ground, and which, united with the reason, forms but the second step in the series of highest conceptions). In all these names, Plotinus does not profess to have satisfactorily expressed the essence of this primal one, but only to have given a representation of it. In characterizing it still farther, he denies it all thinking and willing, because it needs nothing and can desire nothing; it is not energy, but above energy; life does not belong to it; neither being nor essence nor any of the most general categories of being can be ascribed to it; in short, it is that which can neither be expressed nor thought. Plotinus has thoroughly striven to think of this first principle not as first principle, i. e. not in its relation to that of which it is the ground, but only in itself, as being wholly without reference either to us or to any thing else. This pure abstraction, however, he could not carry out. He sets himself to show how every thing else, and especially the two other cosmical principles, could emanate from this first; but in order to have a principle for his emanation theory, he was obliged to consider the first in its relation to the second and as its producer.

3. The Emanation Theory of the New Platonists.—Every emanation theory, and hence also that of the New Platonists, considers the world as the effluence of God, and gives to the emanation a greater or less degree of perfection, according as it is nearer or more remote from its source. They all have for their principle the totality of being, and represent a progressively ascending relation in its several parts. Fire, says Plotinus, emits heat, snow cold, fragrant bodies odors, and every organic thing so far as it is perfect begets something like itself. In the same way the all-perfect and the eternal, in the overflowing of his perfection sends out from himself that which is also eternal, and after him, the best, viz., the reason or world-intelligence, which is the immediate reflection and image of the primal one. Plotinus abounds in figures to show how the primal one need lose nothing nor become weakened by this emanation of reason. Next to the original one, reason is the most perfect. It contains in itself the ideal world, and the whole of true and changeless being. Some notion may be formed of its exaltation and glory by carefully beholding the sensible world in its greatness, its beauty, and the order of its ceaseless motion, and then by rising to contemplate its archetype in the pure and changeless being of the intelligible world, and then by recognizing in intelligence the author and finisher of all. In it there is neither past nor future, but only an ever abiding present. It is, moreover, as incapable of division in space as of change in time. It is the true eternity, which is only copied by time. As reason flows from the primal one, so does the world-soul eternally emanate from reason, though the latter incurs no change thereby. The world-soul is the copy of reason, permeated by it, and actualizing it in an outer world. It gives ideas externally to sensible matter, which is the last and lowest step in the series of emanations and in itself is undetermined, and has neither quality nor being. In this way the visible universe is but the transcript of the world-soul, which forms it out of matter, permeates and animates it, and carries it forward in a circle. Here closes the series of emanations, and, as was the aim of the theory, we have been carried in a constant current from the highest to the lowest, from God to the mere image of true being, or the sensible world.

Individual souls, like the world-soul, are linked both to the higher and the lower, to reason and the sensible; now bound with the latter and sharing its destiny, and anon rising to their source in reason. Their original and proper home was in the rational world, from whence they have come down, each one in its proper time, into the corporeal; not, however, wholly forsaking their ideal abode, but as a sunbeam touches at the same time the sun and the earth, so are they found alike in the world of reason and the world of sense. Our calling, therefore—and here we come back to the point from which we started in our exhibition of New Platonism—can only be to direct our senses and aspirations towards our proper home, in the ideal world, and by asceticism and crucifying of the flesh, to free our better self from its participation with the body. But when our soul has once mounted up to the ideal world, that image of the originally good and beautiful, it then attains the final goal of all its longings and efforts, the immediate union with God, through the enraptured beholding of the primal one in which it loses its consciousness and becomes buried and absorbed.

According to all this, the New Platonic philosophy would seem to be a monism, and thus the most perfect development of ancient philosophy, in so far as this had striven to carry back the sum of all being to one ultimate ground. But as it attained its highest principle from which all the rest was derived, by means of ecstasy, by a mystical self-destruction of the individual person (Ichheit), by asceticism and theurgy, and not by means of self-conscious thinking, nor by any natural or rational way, it is seen that ancient philosophy, instead of becoming perfected in New Platonism, only makes a despairing leap beyond itself to its own self-destruction.