“Man, your head is haunted; you have wheels in your head! You imagine great things, and depict to yourself a whole world of gods that has an existence for you, a spirit-realm to which you suppose yourself to be called, an ideal that beckons to you. You have a fixed idea! Do not think that I am jesting or speaking figuratively when I regard those persons who cling to the Higher, and (because the vast majority belongs under this head) almost the whole world of men, as veritable fools, fools in a madhouse. What is it, then, that is called a "fixed idea"? An idea that has subjected the man to itself. When you recognize, with regard to such a fixed idea, that it is a folly, you shut its slave up in an asylum. And is the truth of the faith, say, which we are not to doubt; the majesty of (e. g.) the people, which we are not to strike at (he who does is guilty of — lese-majesty); virtue, against which the censor is not to let a word pass, that morality may be kept pure; — are these not "fixed ideas"? Is not all the stupid chatter of (e. g.) most of our newspapers the babble of fools who suffer from the fixed idea of morality, legality, Christianity, etc., and only seem to go about free because the madhouse in which they walk takes in so broad a space?”

New York 1907, p. 54, 55
The Ego and Its Own (1845)