Still more impressive, if we consider the writings of Plotinus on their personal side, and as a revelation of their author’s mind, is the high and sustained purity, the absolute detachment and disinterestedness by which they are characterised throughout. No trace of angry passion, no dallying with images of evil, interferes to mar their exalted spirituality from first to last. While the western world was passing through a period of horror and degradation such as had never been known before, the philosopher took refuge in an ideal sphere, and looked down on it all with no more disturbance to his serenity than if he had been the spectator of a mimic performance on the stage.[504] This, indeed, is one of the reasons why the _Enneads_ are so much less interesting, from a literary point of view, than the works of the Roman Stoics. It is not only that we fail to find in them any allusions even of the faintest kind to contemporary events or to contemporary life and manners, such as abound in Seneca and Epictêtus, but there is not the slightest reference to the existence of such a thing as the Roman empire at all. One or two political illustrations occur, but they are drawn from old Greek city life, and were probably suggested by Plato or Aristotle.[505] But this tremendous blank is so perfectly in keeping with the whole spirit of Neo-Platonism as to heighten instead of lowering its aesthetic effect. In studying the philosophy of the preceding centuries, to whatever school it may belong, we have the image of death always before our eyes; and to fortify us against its terrors, we are continually called upon to remember the vanity of life. This is the protest of thought against the world, just as in Lucian and Sextus we hear the protest of the world against thought. At last the whole bitter strife comes to an end, the vision of sense passes away, And leaves us with Plotinus and pure souls. Here we need no deliverance from troubles and indignities which are not felt; nor do we need to be prepared for death, knowing that we can never die. The world will no longer look askance at us, for we have ceased to concern ourselves about its reformation. No scepticism can shake our convictions, for we have discovered the secret of all knowledge through the consciousness of that which is eternal in ourselves. Thus the world of outward experience has dropped out of our thoughts, because thought has orbed into a world of its own. X.