Georges Louis Leclerc, Comte de Buffon, Buffon's Natural History, Volume III… (May 12, 2014 [eBook #45639])
“ Such negative expressions can exhibit no positive ideas: but to say that we are certain of the existence of the former, and that of the latter is less evident; that the substance of the one is simple, indivisible, and has no form, since it only manifests itself by a single modification, which is thought; that the other is a less substance than a subject, capable of receiving different forms, which bear a relation to our senses, but are all as uncertain and variable as the organs themselves ”
