“That faith makes blessed under certain circumstances, that blessedness does not make of a fixed idea a true idea, that faith moves no mountains but puts mountains where there are none: a quick walk through a madhouse enlightens one sufficiently about this.”
— Friedrich Nietzsche
Friedrich Nietzsche, The Antichrist (1888), Sec. 51
Often paraphrased as: A casual stroll through the lunatic asylum shows that faith does not prove anything.
“Faith Saves.—Virtue gives happiness and a state of blessedness only to those who have a strong faith in their virtue:—not, however, to the more refined souls whose virtue consists of a profound distrust of themselves and of all virtue. After all, therefore, it is "faith that saves" here also! (214)”
“It is always a metaphysical belief on which our belief in science rests, —and that even we knowing ones of to-day, the godless and anti-metaphysical, still take our fire from the conflagration kindled by a belief a millennium old, the Christian belief, which was also the belief of Plato, that God is truth, that the truth is divine... (344)”