We have also to note that Plotinus arrives at his Absolute by a method apparently very different from that pursued by either of his teachers. Plato’s primal beauty is, on the face of it, an abstraction and generalisation from all the scattered and imperfect manifestations of beauty to be met with in our objective experience. And Aristotle is led to his conception of an eternal immaterial thought by two lines of analysis, both starting from the phenomena of external Nature. The problem of his _Physics_ is to account for the perpetuity of motion. The problem of his _Metaphysics_ is to explain the transformation of potential into actual existence. Plotinus, on the other hand, is always bidding us look within. What we admire in the objective world is but a reflex of ourselves. Mind is the sole reality; and to grasp this reality under its highest form, we must become like it. Thus the more we isolate our own personality and self-identity from the other interests and experiences of life, the more nearly do we approach to consciousness of and coalescence with the supreme identity wherein all things have their source. But on looking at the matter a little more closely, we shall find that Plotinus only set in a clearer light what had all along been the leading motive of his predecessors. We have already observed that Plato’s whole mythological machinery is only a fanciful way of expressing that independent experience which the mind derives from the study of its own spontaneous activity. And the process of generalisation described in the _Symposium_ is really limited to moral phenomena. Plato’s standpoint is less individualistic than that of Plotinus in so far as it involves a continual reference to the beliefs, experiences, and wants of other men; but it is equally subjective, in the sense of interpreting all Nature by the analogies of human life. There are even occasions when his spiritualism goes the length of inculcating complete withdrawal from the world of common life into an ideal sphere, when he seems to identify evil with matter, when he reduces all virtue to contempt for the interests of the body, in language which his Alexandrian successor could adopt without any modification of its obvious meaning.[434]