- We need not deny that dreams and delirium may have given palpable shape to the conception of a ghost, and may also have helped forward the notion of a spirit by furnishing something intermediary between the grossness of our waking sense- experiences, and the altogether elusive and difficult thought of unembodied will and intelligence independent of space and time. - "The Faith of the Millions (2nd series)", George Tyrrell.
- But the great majority of mankind are utterly unable, without long training, to retain in their minds the unembodied symbols of the pure mathematician, so that, if science is ever to become popular, and yet remain scientific, it must be by a profound study and a copious application of those principles of the mathematical classification of quantities which, as we have seen, lie at the root of every truly scientific illustration. - "Five of Maxwell's Papers", James Clerk Maxwell.
- We know that it is of vast importance in geology, but we are so ambitious to grasp the great, so little accustomed to occupy ourselves with the minute, that we are not yet prepared to enter seriously upon the question how far we can control and utilize the operations, not of unembodied physical forces merely, but of beings, in popular apprehension, almost as immaterial as they. - "The Earth as Modified by Human Action", George P. Marsh.