“there can, we think, be little doubt of the proposition, that the external organs may, from various causes, become so much deranged as to make false representations to the mind; and that, in such cases, men, in the literal sense, really see the empty and false forms and hear the ideal sounds which, in a more primitive state of society, are naturally enough referred to the action of demons or disembodied spirits.”
―
Walter Scott,
Letters on Demonology and Witchcraft