“What the aristocratic civilization of Rome and Greece had meant, only those greater minds, Goethe and Nietzsche, grasped: but to none were those feelings of manly vigour more unintelligible than to the womanish Armageddon of serfs of the nineteenth century; to none less clear than to those unnatural products of that unnatural time, the learned men.
The erudite was the absolute converse of the pagan positive. He studied the ancients because he could not feel them. … But not to all did antiquity remain dry and lifeless. Nietzsche lighted upon the slumber-bound beauty, and awoke her to new life, and released her from the arm of her unloved wooer.”

Sec. 60
The Antichrist (1888)

Source: Vision in Silver

Hess' Diary

Denn gerade die starke Periodizität des Genies bringt es mit sich, daß bei ihm immer erst auf sterile Jahre die fruchtbaren und auf sehr produktive Zeiten immer wieder sehr unfruchtbare folgen—Zeiten, in denen er von sich nichts hält, ja von sich psychologisch (nicht logisch) weniger hält als von jedem anderen Menschen: quält ihn doch die Erinnerung an die Schaffensperiode, und vor allem—wie frei sieht er sie, die von solchen Erinnerungen nicht Belästigten, herumgehen! Wie seine Ekstasen gewaltiger sind als die der anderen, so sind auch seine Depressionen fürchterlicher.
Source: Sex and Character (1903), p. 107.

"Aftermath" in the Baltimore Evening Sun http://www.positiveatheism.org/hist/menck05.htm#SCOPESD (14 September 1925)
1920s
Context: Once more, alas, I find myself unable to follow the best Liberal thought. What the World's contention amounts to, at bottom, is simply the doctrine that a man engaged in combat with superstition should be very polite to superstition. This, I fear, is nonsense. The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous. Is it, perchance, cherished by persons who should know better? Then their folly should be brought out into the light of day, and exhibited there in all its hideousness until they flee from it, hiding their heads in shame.
True enough, even a superstitious man has certain inalienable rights. He has a right to harbor and indulge his imbecilities as long as he pleases, provided only he does not try to inflict them upon other men by force. He has a right to argue for them as eloquently as he can, in season and out of season. He has a right to teach them to his children. But certainly he has no right to be protected against the free criticism of those who do not hold them.... They are free to shoot back. But they can't disarm their enemy.
The meaning of religious freedom, I fear, is sometimes greatly misapprehended. It is taken to be a sort of immunity, not merely from governmental control but also from public opinion. A dunderhead gets himself a long-tailed coat, rises behind the sacred desk, and emits such bilge as would gag a Hottentot. Is it to pass unchallenged? If so, then what we have is not religious freedom at all, but the most intolerable and outrageous variety of religious despotism. Any fool, once he is admitted to holy orders, becomes infallible. Any half-wit, by the simple device of ascribing his delusions to revelation, takes on an authority that is denied to all the rest of us.... What should be a civilized man's attitude toward such superstitions? It seems to me that the only attitude possible to him is one of contempt. If he admits that they have any intellectual dignity whatever, he admits that he himself has none. If he pretends to a respect for those who believe in them, he pretends falsely, and sinks almost to their level. When he is challenged he must answer honestly, regardless of tender feelings.

Source: Lucky Jim

Glacial (p. 102)
Short fiction, Galactic North (2006)

pg 28
The Unbearable Lightness of Being (1984), Part One: Lightness and Weight