“Note the men’s fear that if they reported this to the authorities, not only would they not be believed, they would be ridiculed.”

Source: The Forge of God (1987), Chapter 52 (p. 352)

In London Calling http://books.google.pt/books?id=l80fAQAAMAAJ&q=%22Men+tend+to+have+the+beliefs+that+suit+their+passions.%22&dq=%22Men+tend+to+have+the+beliefs+that+suit+their+passions.%22&hl=pt-PT&sa=X&ei=q9mEUcj-AoqM7AbW3IGoBQ&ved=0CFMQ6AEwBw (1947), p. 18
1940s

Contra epistolam Manichaei

Conclusion : The Moral of this Examination
A Perplexed Philosopher (1892)
Context: It is not merely the authority of Mr. Spencer as a teacher on social subjects that I would discredit; but the blind reliance upon authority. For on such subjects the masses of men cannot safely trust authority. Given a wrong which affects the distribution of wealth and differentiates society into the rich and the poor, and the recognized organs of opinion and education, since they are dominated by the wealthy class, must necessarily represent the views and wishes of those who profit or imagine they profit by the wrong.
That thought on social questions is so confused and perplexed, that the aspirations of great bodies of men, deeply though vaguely conscious of injustice, are in all civilized countries being diverted to futile and dangerous remedies, is largely due to the fact that those who assume and are credited with superior knowledge of social and economic laws have devoted their powers, not to showing where the injustice lies but to hiding it; not to clearing common thought but to confusing it.

Letter to William Eustis http://books.google.com/books?id=S088AAAAIAAJ&pg=PA319 (22 June 1809), published in Writings of John Quincy, Adams (1914), The Macmillan company.
Variant: All men profess honesty as long as they can. To believe all men honest would be folly. To believe none so is something worse.

Diary of an Unknown (1988)

IV, 3, 22.
Historiarum Alexandri Magni Macedonis Libri Qui Supersunt, Book IV

XIX. Why sinners are not punished at once.
On the Gods and the Cosmos
Context: It is not only spirits who punish the evil, the soul brings itself to judgment: and also it is not right for those who endure for ever to attain everything in a short time: and also, there is need of human virtue. If punishment followed instantly upon sin, men would act justly from fear and have no virtue.

Source: p.19 Thank You and You're Welcome (2009)