"I suspect we have internal senses. The mind's eye since Shakespeare's time has been proverbial; and we have also a mind's ear. To say nothing of dreams, one certainly can listen to one's own thoughts, and hear them, or believe that one hears them: the strongest argument adducible in favour of our hearing any thing."
~Augustus William Hare and Julius Charles Hare, Guesses at Truth, by Two Brothers, 1827