THREE:It is well known that Spinoza draws a sharp line of demarcation between the two attributes of Extension and Thought, which, with him, correspond to what are usually called body and mind. Neither attribute can act on the other. Mind receives no impressions from body, nor does body receive any impulses from mind. This proposition follows by rigorous logical necessity from the Platonic principle that mind is independent of body, combined with the Stoic principle that nothing but body can act on body, generalised into the wider principle that interaction implies homogeneity of nature. According to some critics, Spinozas teaching on this point constitutes a fatal flaw in his philosophy. How, it is asked, can we know that there is any such thing as body (or extension) if body cannot be perceived,for perceived it certainly cannot be without acting on our minds? The idea of infinite substance suggests a way out of the408 difficulty. I find in myself, Spinoza might say, the idea of extension. In fact, my mind is nothing but the idea of extension, or the idea of that idea, and so on through as many self-reflections as you please. At the same time, mind, or thought, is not itself extended. Descartes and the Platonists before him have proved thus much. Consequently I can conceive extension as existing independently of myself, and, more generally, of all thought. But how can I be sure that it actually does so exist? In this wise. An examination of thought leads me to the notion of something in which it residesa substance whose attribute it is. But having once conceived such a substance, I cannot limit it to a single attribute, nor to two, nor to any finite number. Limitation implies a boundary, and there can be no boundary assigned to existence, for existence by its very definition includes everything that is. Accordingly, whatever can be conceived, in other words whatever can be thought without involving a contradiction,an important reservation which I beg you to observe,must necessarily exist. Now extension involves no contradiction, therefore it exists,exists, that is to say, as an attribute of the infinite substance. And, by parity of reasoning, there must be an idea of extension; for this also can exist without involving a contradiction, as the simplest introspection suffices to show. You ask me why then I do not believe in gorgons and chimaeras. I answer that since, in point of fact, they do not exist, I presume that their notion involves a contradiction, although my knowledge of natural law is not sufficiently extended to show me where the contradiction lies. But perhaps science will some day be able to point out in every instance of a non-existing thing, where the contradiction lies, no less surely than it can now be pointed out in the case of impossible geometrical figures. In short, while other people travel straight from their sensations to an external world, Spinoza travels round to it by the idea of an infinite substance.564The inconsistencies of a great philosophical system are best explained by examining its historical antecedents. We have already attempted to disentangle the roots from which Stoicism was nourished, but one of the most important has not yet been taken into account. This was the still continued influence of Parmenides, derived, if not from his original teaching, then from some one or more of the altered shapes through which it had passed. It has been shown how Zeno used the Heracleitean method to break down all the demarcations laboriously built up by Plato and Aristotle. Spirit was identified with matter; ideas with aerial currents; God with the world; rational with sensible evidence; volition with judgment; and emotion with thought. But the idea of a fundamental antithesis, expelled from every other department of enquiry, took hold with all the more energy on what, to Stoicism, was the most vital of all distinctionsthat between right and wrong.57 Once grasp this transformation of a metaphysical into a moral principle, and every paradox of the system will be seen to follow from it with logical necessity. What the supreme Idea had been to Plato and self-thinking thought to Aristotle, that virtue became to the new school, simple, unchangeable, and self-sufficient. It must not only be independent of pleasure and pain, but absolutely 26incommensurable with them; therefore there can be no happiness except what it gives. As an indivisible unity, it must be possessed entirely or not at all; and being eternal, once possessed it can never be lost. Further, since the same action may be either right or wrong, according to the motive of its performance, virtue is nothing external, but a subjective disposition, a state of the will and the affections; or, if these are to be considered as judgments, a state of the reason. Finally, since the universe is organised reason, virtue must be natural, and especially consonant to the nature of man as a rational animal; while, at the same time, its existence in absolute purity being inconsistent with experience, it must remain an unattainable ideal.
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