We are, for the rest, so wrapped up in sensations that none of our boldest conceptions can break through the circle. - Alfred Binet

When making the analysis of matter we impliedly admitted two propositions: first, that sensation is the tertium quid which is interposed between the excitant of our sensory nerves and ourselves; secondly, that the aggregate of our sensations is all we can know of the outer world, so that it is correct to define this last as the collection of our present, past, and possible sensations.

The world is but an assembly of present, past, and possible sensations; the affair of science is to analyze and co-ordinate them by separating their accidental from their constant relations.

The mechanical conception of the universe is nothing but naïve realism.