We have seen how Plotinus establishes the spiritualistic basis of his philosophy. We have now to see how he works out from it in all directions, developing the results of his previous enquiries into a complete metaphysical system. It will have been observed that the whole method of reasoning by which materialism was overthrown, rested on the antithesis between the unity of consciousness and the divisibility of corporeal substance. Very much the same method was afterwards employed by Cartesianism to demonstrate the same conclusion. But with Descartes and his followers, the opposition between soul and body was absolute, the former being defined as pure thought, the latter as pure extension. Hence the extreme difficulty which they experienced in accounting for the evident connexion between the two. The spiritualism of Plotinus did not involve any such impassable chasm between consciousness and its object. According to him, although the soul is contained in or depends on an absolutely self-identical unity, she is not herself that unity, but in some degree shares the characters of divisibility and extension.[447] If we conceive all existence as bounded at either extremity by two principles, the one extended and the other inextended, then soul will still stand midway between them; not divided in herself, but divided in respect to the bodies which she animates. Plotinus holds that such an assumption is necessitated by the facts of sensation. A feeling of pain, for example, is located in a particular point of the body, and is, at the same time, apprehended as my feeling, not as some one else’s. A similar synthesis obtains through the whole of Nature. The visible universe consists of many heterogeneous parts, held together by a single animating principle. And we can trace the same qualities and figures through a multitude of concrete individuals, their essential unity remaining unbroken, notwithstanding the dispersion of the objects in which they inhere.