“Maybe anything's right, he mumbled. Yes, if the world as men had made it was right, then anything else was right, any act a man took to satisfy himself, murder, theft, torture. He straightened with a start. What was happening to him? … He was going to do something, but what? Yes, he was afraid of himself, afraid of doing some nameless thing.”

Little Children (1937)

As quoted in The Works of the Emperor Julian (1923) by Wilmer Cave France Wright, p. 91
General sources

The trial of Charles B. Reynolds for blasphemy (1887)
Context: Religions are for a day. They are the clouds. Humanity is the eternal blue. Religions are the waves of the sea. These waves depend upon the force and direction of the wind -- that is to say, of passion; but Humanity is the great sea. And so our religions change from day to day, and it is a blessed thing that they do. Why? Because we grow, and we are getting a little more civilized every day, -- and any man that is not willing to let another man express his opinion, is not a civilized man, and you know it. Any man that does not give to everybody else the rights he claims for himself, is not an honest man.

The Golden Man (1954)
Context: "We were always afraid a mutant with superior intellectual powers would come along," Baines said reflectively. "A deeve who would be to us what we are to the great apes. Something with a bulging cranium, telepathic ability, a perfect semantic system, ultimate powers of symbolization and calculation. A development along our own path. A better human being."
"He acts by reflex," Anita said wonderingly. She had the analysis and was sitting at one of the desks studying it intently. "Reflex — like a lion. A golden lion." She pushed the tape aside, a strange expression on her face. "The lion god."
"Beast," Wisdom corrected tartly. "Blond beast, you mean."
"He runs fast," Baines said, "and that's all. No tools. He doesn't build anything or utilize anything outside himself. He just stands and waits for the right opportunity and then he runs like hell."
"This is worse than anything we've anticipated," Wisdom said. His beefy face was lead-gray. He sagged like an old man, his blunt hands trembling and uncertain. "To be replaced by an animal! Something that runs and hides. Something without a language!" He spat savagely. "That's why they weren't able to communicate with it. We wondered what kind of semantic system it had. It hasn't got any! No more ability to talk and think than a — dog."

On Henry John Temple, 3rd Viscount Palmerston, as quoted in Victorian England : Aspects of English and Imperial History, 1837-1901 (1973) by Lewis Charles Bernard Seaman, p. 108

Source: The Wailing Asteroid (1960), Chapter 3

Source: Existentialism Is a Humanism (1946), p. 28

Sec. 872 (Notebook W I 1. Spring 1884, KGW VII, 2.97-8, KSA 11.101-2)
The Will to Power (1888)

Homecoming saga, The Ships Of Earth (1994)