The noble spirit of Marcus Aurelius was, indeed, proof against such temptations: and he had far more to dread than to hope from the unlightened voice of public opinion; but to him also, ‘standing between two eternities,’ Nature presented herself chiefly under the aspect of an overwhelming and absorbing Power. Pleasure is not so much dangerous as worthless, weak, and evanescent. Selfishness, pride, anger, and discontent will soon be swept into abysmal gulfs of oblivion by the roaring cataract of change. Universal history is one long monotonous procession of phantasms passing over the scene into death and utter night. In one short life we may see all that ever was, or is, or is to be; the same pageant has already been and shall be repeated an infinite number of times. Nothing endures but the process of unending renovation: we must die that the world may be ever young. Death itself only reunites us with the absolute All whence we come, in which we move, and whither we return.[103] But the imperial sage makes no attempt to explain why we should ever have separated ourselves from it in thought; or why one life should be better worth living than another in the universal vanity of things. The physics of Stoicism was, in truth, the scaffolding rather than the foundation of its ethical superstructure. The real foundation was the necessity of social existence, formulated under the influence of a logical exclusiveness first introduced by Parmenides, and inherited from his teaching by every system of philosophy in turn. Yet there is no doubt that Stoic morality was considerably strengthened and steadied by the support it found in conceptions derived from a different order of speculations; so much so that at last it grew to conscious independence of that support. Marcus Aurelius, a constant student of Lucretius, seems to have had occasional misgivings with respect to the certainty of his own creed; but they never extended to his practical beliefs. He was determined that, whatever might be the origin of this world, his relation to it should be still the same. ‘Though things be purposeless, act not thou without a purpose.’ ‘If the universe is an ungoverned chaos, be content that in that wild torrent thou hast a governing reason within thyself.’[104] There seems, then, good reason for believing that the law of duty, after being divorced from mythology, and seriously compromised by its association, even among the Stoics themselves, with our egoistic instincts, gained an entirely new authority when placed, at least in appearance, under the sanction of a power whose commands did not even admit of being disobeyed. And the question spontaneously presents itself whether we, after getting rid of the old errors and confusions, may profitably employ the same method in defence of the same convictions, whether the ancient alliance between fact and right can be reorganised on a basis of scientific proof.