“Ridicule parts social life like an invisible paling; and we are all of us afraid of the other. To this may be in great measure attributed the difference that exists between an author's writings and his conversation. The one is often sad and thoughtful, while the other is lively and careless. The fact is, that the real character is shown in the first instance, and the assumed in the second.”
The Monthly Magazine
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Letitia Elizabeth Landon 785
English poet and novelist 1802–1838Related quotes
On writing characters in “Interviews with authors at EMWF: Uzma Jalaluddin” https://theontarion.com/2018/09/13/interviews-with-authors-at-emwf-uzma-jalaluddin/ in The Ontarion (2018 Sep 13)

No.16. Ivanhoe — ROWENA.
Literary Remains

What for the others are necessities and conditions of life are death to us.
No Compromise – No Political Trading (1899)
At the other extreme is a set of parts that are completely unrelated: that is, a change in each part depends only on that part alone. The variation in the set is the physical sum of the variations of the parts. Such behavior is called independent or physical summativity.
Source: Definition of System, 1956, p. 23

Friedrich Wilhelm Schelling, On the History of Modern Philosophy (1833) [Translated from the German by Andrew Bowie]
S - Z

Part 2: Metaphysical Rebellion; also quoted in Albert Camus : The Invincible Summer (1958) by Albert Maquet, p. 86; a remark made about the Marquis de Sade
The Rebel (1951)
Against Authority: Freedom and the Rise of Surveillance States (2014)