My hand moves because certain forces--electric, magnetic, or whatever 'nerve-force' may prove to be--are impressed on it by my brain. This nerve-force, stored in the brain, would probably be traceable, if Science were complete, to chemical forces supplied to the brain by the blood, and ultimately derived from the food I eat and the air I breathe.
Lewis CarrollI maintain that any writer of a book is fully authorised in attaching any meaning he likes to a word or phrase he intends to use. If I find an author saying, at the beginning of his book, "Let it be understood that by the word 'black' I shall always mean 'white,' and by the word 'white' I shall always mean 'black,'" I meekly accept his ruling, however injudicious I think it.
Lewis Carroll