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 certain elements of experience and not to others, and those chiefly regarded must have a certain interpretation put upon them by trained apperception. The rest must be treated as moonshine and taken no account of except perhaps in idle and poetic revery. In this way crude experience grows reasonable and appearance becomes knowledge of reality.

The fundamental reason, then, why we attribute consciousness to natural bodies is that those bodies, before they are conceived to be merely material, are conceived to possess all the qualities which our own consciousness possesses when we behold them. Such a supposition is far from being a paradox, since only this principle justifies us to this day in believing in whatever we may decide to believe in. The qualities attributed to reality must be qualities found in experience, and if we deny their presence in ourselves (e.g., in the case of omniscience), that is only because the idea of self, like that of matter, has already become special and the region of ideals (in which omniscience lies) has been formed into a third sphere. But before the idea of self is well constituted and before the category of ideals has been conceived at all, every ingredient ultimately assigned to those two regions is attracted into the perceptual vortex for which such qualities as pressure and motion supply a nucleus. The moving image is therefore impregnated not only with secondary qualities—colour, heat, etc.—but with qualities which