Probably to a thorough-going empiricist, and certainly to a thorough-going materialist, it will appear quite unnecessary to translate the obvious spectacle of the world, with oneself as a physical body in the centre of it, into mental symbols and pictorial representations of the above character. Of such an one I would only ask, in what sort of manner he visualizes, when he thinks of it at all, the "soul" which he feels conscious of in his own body; and in the second place how he visualizes the connection between the will, the instinct, the reason and so forth, which animate his body and endow it with living purpose? It will be found much easier for critics to reject the particular image which has commended itself to me as suggestive of the mystery with which we have to deal, than for them to drive out and expel from their own thought the insidious human tendency towards pictorial representation.
I would commend to any sardonic psychologist whose "malice" leads him to derive pleasure from the little weaknesses of philosophers, to turn his attention to the ideal systems of supposedly "pure thought." He will find infinite satisfaction for his spleen in the crafty manner in which "impure" thought--that is to say thought by means of pictorial images--passes itself off as "pure" and conceals its lapses.
Truth, as the complex vision clearly enough reveals to us, refuses to be dealt with by "pure" thought. To deal with truth one has to use "impure" thought, in other words thought that is dyed in the grain by taste, instinct, intuition, imagination. And every philosopher who attempts to round off his system by pure reason alone, and who refuses to recognize that the only adequate organ of research is the complex vision, is a philosopher who sooner or later will be caught red-handed in the unphilosophic act of covering his tracks.
No philosopher is on safe ground, no philosopher can offer us a massive organic concrete representation of reality who is shy of all pictorial images. They are dangerous and treacherous things; but it is better to be led astray by them than to avoid them altogether.
The mythological symbolism of antique thought was full of this pictorial tendency and even now the shrewdest of modern thinkers are compelled to use images drawn from antique mythology. Poetic thought may go astray. But it can never negate itself into quite the thin simulacrum of reality into which pure reason divorced from poetic imagery is capable of fading.