THREE:Whether Plotinus was or was not the disciple of Ammonius, it is beyond all doubt that he considered himself the disciple of Plato. There are more than a hundred references to that philosopher in the Enneads, against less than thirty references to all the other ancient thinkers put together;428 and, what is more remarkable, in only about half of them is he mentioned by name. The reader is expected to know that he always means Plato. And it is an article of faith with Plotinus that his master cannot be mistaken; when the words of oracular wisdom seem to contradict one another, there must be some way of harmonising them. When they contradict what he teaches himself, the difficulty must be removed by skilful interpretation; or, better still, it must be discreetly ignored.429 On the other hand, when a principle is palpably borrowed from Aristotle, not only is its derivation unacknowledged, but we are given to understand by implication that it belongs to the system which Aristotle was at most pains to controvert.430Historians often speak as if philosophy took an entirely fresh start at different epochs of its existence. One such break is variously associated with Descartes, or Bacon, or some one of their Italian predecessors. In like manner, the introduction of Christianity, coupled with the closing of the Athenian schools by Justinian, is considered, as once was the suppression of the West-Roman Caesarate by Odoacer, to mark the beginning of a new rgime. But there can be no more a real break in the continuity of intellectual than in the continuity of political history, beyond what sleep or inactivity may simulate in the life of the organic aggregate no less than in the life of the organic individual. In each instance, the thread is taken up where it was dropped. If the rest of the world has been advancing meanwhile, new tendencies will come into play, but only by first attaching themselves to older lines of movement. Sometimes, again, what seems to be a revolution is, in truth, the revival or liberation of an earlier movement, through the decay or destruction of beliefs364 which have hitherto checked its growth. Thus the systems of Plato and Aristotle, after carrying all before them for a brief period, were found unsuitable, from their vast comprehension and high spirituality, to the undeveloped consciousness of their age, and were replaced by popularised versions of the sceptical or naturalistic philosophies which they had endeavoured to suppress. And when these were at length left behind by the forward movement of the human mind, speculative reformers spontaneously reverted to the two great Socratic thinkers for a better solution of the problems in debate. After many abortive efforts, a teacher appeared possessing sufficient genius to fuse their principles into a seemingly coherent and comprehensive whole. By combining the Platonic and Aristotelian spiritualism with a dynamic element borrowed from Stoicism, Plotinus did for an age of intellectual decadence what his models had done in vain for an age of intellectual growth. The relation in which he stood to Stoicism, Epicureanism, and Scepticism, reproduced the relation in which they stood to the various physical and sophistic schools of their time; but the silent experience of six centuries won for him a much more enduring success.