Porphyry, one of the most distinguished of the Neo-Platonists, disciple, biographer, and expounder of Plotinus, was born in 232 or 233 in the Orient (perhaps at Tyre), and at the age of thirty went to Rome, where he came into connection with Plotinus, and spent a large part of his life. He was a man of wide and varied learning; and though not an original thinker, he was a clear and vigorous writer and expounder of the philosophy of Plotinus. It may be well, at this point, to say a word about that remarkable school or system of philosophy, of which Plotinus was the greatest master and Porphyry the chief expounder. Neo-Platonism was the most prominent phenomenon of the age in the philosophic world. The object of the Neo-Platonists was both speculative and practical: on the one side to elaborate an eclectic system of philosophy which should reconcile Platonism and Aristotelianism, and at the same time do justice to elements of truth in other schools of thought; on the other side, to revivify and strengthen the old paganism by idealizing and purifying it for the sake of the philosophers, and at the same time by giving it a firmer philosophic basis than it had hitherto possessed. Neo-Platonism, taken as a whole, has therefore both a philosophic and a religious motive. It may be defined in the briefest terms, in its philosophic aspect, as an eclectic revival of Greek metaphysics (especially Platonic-Aristotelian), modified by the influence of Oriental philosophy and of Christianity; in its religious aspect, as an attempt to restore and regenerate paganism by means of philosophy. In its earlier and better days, the philosophic element greatly predominated,—in fact, the religious element may be said to have been, in large part, a later growth; but gradually the latter came more and more into the foreground, until, under Jamblichus (d. 330 a.d.), the chief master of the Syrian school, Neo-Platonism degenerated into a system of religious mysteries, in which theurgic practices played a prominent part. Under Proclus (d. 485), the great master of the Athenian school, the philosophic element was again emphasized; but Aristotelianism now gained the predominance, and the system became a sort of scholastic art, and gradually degenerated into pure formalism, until it finally lost all influence. The extent of the influence which Christianity exerted upon Neo-Platonism is a greatly disputed point. We shall, perhaps, come nearest the truth if we say that its influence was in the main not direct, but that it was nevertheless real, inasmuch as it had introduced problems up to that time undiscussed, with which Neo-Platonism busied itself; in fact, it may almost be said that Neo-Platonism was at first little more than (Aristotelian-) Platonism busying itself with the new problems of salvation and redemption which Christianity had thrown into the world of thought. It was un-Christian at first (it became under Porphyry and later Neo-Platonists anti-Christian), because it solved these problems in a way different from the Christian way. This will explain the fact that all through, whether in the more strictly philosophic system of Plotinus, or in the more markedly religious and theurgic system of Jamblichus, there ran a vein of mysticism, the conception of an intimate union with the supreme God as the highest state to which man can attain. Porphyry, with whom we are at present concerned, was eminently practical in his thinking. The end of philosophy with him was not knowledge, but holiness, the salvation of the soul. He recommended a moderate asceticism as a chief means of freeing the soul from the bonds of matter, and thus permitting it to rise to union with God. At the same time, he did not advise the neglect of the customary religious rites of Paganism, which might aid in the elevation of the spirit of man toward the deity. It was with Porphyry that Neo-Platonism first came into direct conflict with Christianity, and its enmity against the latter goes far to explain the increasing emphasis which he and the Neo-Platonists who followed him laid upon religious rites and practices. Its philosophy, its solution of the great problems of the age, was essentially and radically different from that of Christianity; and although at first they might run alongside one another as independent schools, without much thought of conflict, it was inevitable that in time the rivalry, and then the active hostility, should come. Neo-Platonism, like Christianity, had a solution of the great problem of living to offer to the world,—in an age of unexampled corruption, when thoughtful men were all seeking for a solution,—and each was essentially exclusive of the other. The attack, therefore, could not be long delayed. Porphyry seems to have begun it in his famous work in fifteen books, now lost, which was answered in extenso by Methodius of Tyre, Eusebius, and Apolinarius of Laodicea. The answers, too, have perished; but from extant fragments we are able to see that Porphyry’s attack was very learned and able. He endeavored to point out the inconsistencies in the sacred narrative, in order to discredit its divine origin. At the same time, he treated Christ with the greatest respect, and ranked him very high as a sage (though only human), and found much that was good in his teaching. Augustine (De consensu Evang. I. 15) says that the Neo-Platonists praised Christ, but railed at his disciples (cf. Eusebius’ words in this chapter). Porphyry was a very prolific writer; but only a few of his works are now extant, chief among them the ἀφορμαὶ πρὸς τὰ νοητ€, or Sententiæ, a brief but comprehensive exposition of his philosophic system. We learn from this chapter that he had met Origen when very young (he was but about twenty when Origen died); where, we do not know. He lived to be at least sixty-eight years old (see his Vita Plot. 23), and Suidas says that he died under Diocletian, i.e. before 305 a.d. On Porphyry and Neo-Platonism in general, see the great works of Vacherot (Hist. critique de l’Ecole d’Alexandrie) and Simon (Hist. de l’Ecole d’Alexandrie); also Zeller’s Philosophie der Griechen, and especially Erdmann’s History of Philosophy (Engl. trans., London, 1889).