But numerous as are the obligations, whether real or imaginary, of the Alexandrian to the Athenian teacher, they range over a comparatively limited field. What most interests a modern student in Platonism—its critical preparation, its conversational dialectic, its personal episodes, its moral enthusiasm, its political superstructure—had apparently no interest for Plotinus as a writer. He goes straight to the metaphysical core of the system, and occupies himself with re-thinking it in its minutest details. Now this was just the part which had either not been discussed at all, or had been very insufficiently discussed by his predecessors. It would seem that the revival of Platonic studies had followed an order somewhat similar to the order in which Plato’s own ideas were evolved. The scepticism of the _Apologia_ had been taken up and worked out to its last consequences by the New Academy. The theory of intuitive knowledge, the ethical antithesis between reason and passion, and the doctrine of immortality under its more popular form, had been resumed by the Greek and Roman Eclectics. Plutarch busied himself with the erotic philosophy of the _Phaedrus_ and the _Symposium_, as also did his successor, Maximus Tyrius. In addition to this, he and the other Platonists of the second century paid great attention to the theology adumbrated in those dialogues, and in the earlier books of the _Republic_. But meanwhile Neo-Pythagoreanism had intervened to break the normal line of development, and, under its influence, Plutarch passed at once to the mathematical puzzles of the _Timaeus_. With Plato himself the next step had been to found a state for the application of his new principles; and such was the logic of his system, that the whole stress of adverse circumstances could not prevent the realisation of a similar scheme from being mooted in the third century; while, as we have seen, something more remotely analogous to it was at that very time being carried out by the Christian Church. Plato’s own disappointed hopes had found relief in the profoundest metaphysical speculations; and now the time has come when his labours in this direction were to engage the attention hitherto absorbed by the more popular or literary aspects of his teaching.