FORE:We are now in a position to understand the full force of Descartes Cogito ergo sum. It expresses the substantiality of self-conscious Form, the equal claim of thought with extension to be recognised as an element of the universe. This recognition of self-consciousness as the surest reality was, indeed, far from being new. The Greek Sceptics had never gone to the length of doubting their own personal existence. On the contrary, they professed a sort of subjective idealism. Refusing to go beyond their own consciousness, they found in its undisturbed self-possession the only absolute satisfaction that life could afford. But knowledge and reality had become so intimately associated with something independent of mind, and mind itself with a mere reflection of reality, that the denial of an external world393 seemed to the vulgar a denial of existence itself. And although Aristotle had found the highest, if not the sole absolute actuality in self-thinking thought, he projected it to such a distance from human personality that its bearing on the sceptical controversy had passed unperceived. Descartes began his demonstration at the point where all the ancient systems had converged, but failed to discover in what direction the conditions of the problem required that they should be prolonged. No mistake can be greater than to regard him as the precursor of German philosophy. The latter originated quite independently of his teaching, though not perhaps of his example, in the combination of a much profounder scepticism with a much wider knowledge of dogmatic metaphysics. His method is the very reverse of true idealism. The Cogito ergo sum is not a taking up of existence into thought, but rather a conversion of thought into one particular type of existence. Now, as we have seen, all other existence was conceived as extension, and however carefully thought might be distinguished from this as absolutely indivisible, it was speedily reduced to the same general pattern of inclusion, limitation, and expansion. Whereas Kant, Fichte, and Hegel afterwards dwelt on the form of thought, Descartes attended only to its content, or to that in which it was contained. In other words, he began by considering not how he thought but what he thought and whence it camehis ideas and their supposed derivation from a higher sphere. Take, for example, his two great methods for proving the existence of God. We have in our minds the idea of a perfect beingat least Descartes professed to have such an idea in his mind,and we, as imperfect beings, could not have originated it for ourselves. It must, therefore, have been placed there by a perfect being acting on us from without. It is here taken for granted that the mechanical equivalence between material effects and their causes must obtain in a world where spatial relations, and therefore measurement, are presumably394 unknown. And, secondly, existence, as a perfection, is involved in the idea of a perfect being; therefore such a being can only be conceived as existing. Here there seems to be a confused notion that because the properties of a geometrical figure can be deduced from its definition, therefore the existence of something more than a simple idea can be deduced from the definition of that idea itself. But besides the mathematical influence, there was evidently a Platonic influence at work; and one is reminded of Platos argument that the soul cannot die because it participates in the idea of life. Such fallacies were impossible so long as Aristotles logic continued to be carefully studied, and they gradually disappeared with its revival. Meanwhile the cat was away, and the mice used their opportunity.The last-named thinker would, no doubt, repudiate the title of pantheist; and it is certain that, under his treatment, pantheism has reverted, by a curious sort of atavism, to something much more nearly resembling the original doctrine of the Neo-Platonic school. Mr. Spencer tells us that the world is the manifestation of an unknowable Power. Plotinus said nearly the same, although not in such absolutely self-contradictory terms.524 Mr. Spencer constantly assumes, by speaking of354 it in the singular number, that the creative Power of which we know nothing is one; having, apparently, convinced himself of its unity by two methods of reasoning. First, he identifies the transcendent cause of phenomena with the absolute, which is involved in our consciousness of relation; leaving it to be inferred that as relativity implies plurality, absoluteness must imply unity. And, secondly, from the mutual convertibility of the physical forces, he infers the unity of that which underlies force. Plotinus also arrives at the same result by two lines of argument, one posteriori, and derived from the unity pervading all Nature; the other priori, and derived from the fancied dependence of the Many on the One. Even in his use of the predicate Unknowable without a subject, Mr. Spencer has been anticipated by Damascius, one of the last Neo-Platonists, who speaks of the supreme principle as τ? ?γνωστον.525 And the same philosopher anticipates the late Father Dalgairns in suggesting the very pertinent question, how, if we know nothing about the Unknowable, we know that it is unknowable.
