Karl Pearson Quote

The science of the future, while agnostic as to the supersensuous, will replace knowledge by belief in the perceptual sphere, and reserve the term knowledge for the conceptual sphere - the region of their own concepts and ideas - of ether, atom, organic corpuscle, and Loading. Loading... vital force - of physical and plasmic mechanics.

The Grammar of Science (2nd edition), Preface to the Second Edition (pp. vii-viii)