“If I am not for myself, who will be for me? But if I am only for myself, who am I? And if not now, when? That which is hateful to you, do not do to your fellow [...] go and learn.”

As quoted in Halliwell's Filmgoer's Companion (1988) by Leslie Halliwell, p. 622

After the possibility of abdication was reported in the newspapers, she left for Cannes, 3 December 1936.
Matthew, H. C. G., ‘Edward VIII [later Prince Edward, duke of Windsor] (1894–1972)’, Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, Jan 2008 accessed 21 Nov 2008 http://www.oxforddnb.com/view/article/31061,

Ich setze Mich nicht voraus, weil Ich Mich jeden Augenblick überhaupt erst setze oder schaffe, und nur dadurch Ich bin, dass Ich nicht vorausgesetzt, sondern gesetzt bin, und wiederum nur in dem Moment gesetzt, wo ich mich setze, d.h. Ich bin Schöpfer un Geschöpf in Einem.
Cambridge 1995, p. 135
The Ego and Its Own (1845)

Interview in Film Culture, no. 42 (1966), p. 101 https://books.google.it/books?hl=it&id=Jq2RAAAAIAAJ&dq=%22If+you+know%22.

Part III, Chapter III (p. 193)
The Privilege of the Sword (2006)

Variant: I will prove myself strong when they think I am sick. I will prove myself brave when they think I am weak -Cady Sinclair
Source: We Were Liars

"Letter to N.N.," quoted by Havelock Ellis in "The New Spirit" http://books.google.com/books?id=xCp6OIGcojMC& (1892) p. 226

Si je crois en Dieu? Oui, quand je travaille. Quand je suis soumis et modeste, je me sens tellement aidé par quelqu'un qui me fait faire des choses qui me surpassent. Pourtant je ne me sens envers lui aucune reconnaissance car c'est comme si je me trouvais devant un prestidigitateur dont je ne puis percer les tours.
1940s, Jazz (1947)

Biff
Source: Death of a Salesman (1949)