“The man resolved, and steady to his trust,
Inflexible to ill, and obstinately just,
May the rude rabble's insolence despise,
Their senseless clamours and tumultuous cries;
The tyrant's fierceness he beguiles,
And the stern brow, and the harsh voice defies,
And with superior greatness smiles.”

Source: The House of Hades

Part I, Essay 6: Of The Independency of Parliament; first line often paraphrased as "It is a just political maxim, that every man must be supposed a knave."
Essays, Moral, Political, and Literary (1741-2; 1748)
Context: It is, therefore, a just political maxim, that every man must be supposed a knave: Though at the same time, it appears somewhat strange, that a maxim should be true in politics, which is false in fact. But to satisfy us on this head, we may consider, that men are generally more honest in their private than in their public capacity, and will go greater lengths to serve a party, than when their own private interest is alone concerned. Honour is a great check upon mankind: But where a considerable body of men act together, this check is, in a great measure, removed; since a man is sure to be approved of by his own party, for what promotes the common interest; and he soon learns to despise the clamours of adversaries.

17 March 1748
Letters to His Son on the Art of Becoming a Man of the World and a Gentleman (1774)

Il ne s'est jamais rien fait de grand dans le monde que par le courage et la fermeté d'un seul homme qui brave les préjugés de la multitude.
[in Gracchus Babeuf avec les Egaux, Jean-Marc Shiappa, Les éditions ouvrières, 1991, 43, 27082 2892-7]
On prejudices

Source: The Man Who Studied Yoga (1956), Ch. 5

Poeta Fit, Non Nascitur, last stanza
Rhyme? and Reason? (1883)

Source: Romancing Mister Bridgerton

The Virtues of a Religious Superior

1940s–present, Introduction to Nietzsche's The Antichrist