“The case is a good example of what Van Vogt came to call "the violent man" or the "Right Man." He is a man driven by a manic need for self-esteem — to feel that he is a "somebody." He is obsessed by the question of "losing face," so will never, under any circumstances, admit that he might be in the wrong.”

The Green Book (1975)
The Green Book (1975)

As quoted in SF Authors Remember A.E. van Vogt (2000) http://www.sfrevu.com/ISSUES/2000/ARTICLES/20000128-03.htm#SF%20Authors%20Remeber%20A.E.%20van%20Vogt
Context: At the end of June in 1939 I took a bus east to New York to attend the first World Science Fiction convention. On the bus with me I took the June of Astounding Science-Fiction in which the short story by A. E. van Vogt appeared. It was an astonishing encounter. In that same issue with him were C. L. Moore and Ross Rocklynne, a fantastic issue to take with me on that long journey, for I was still a poor unpublished writer selling newspapers on a street corner for ten dollars a week and hoping, someday, to be an established writer myself, but that was still two years off. On the way I drank in the words of A. E. Van Vogt and was stunned by what I saw there. He became a deep influence for the next year.
As it turned out, I didn't become A. E. Van Vogt, no one else could, and when I finally met him was pleased to see that the man was as pleasant to be with as were his stories. I knew him over a long period of years and he was a kind and wonderful gentleman, a real asset to the Science Fantasy Society in L. A., where there are a lot of strange people. A. E. Van Vogt was not strange, he was kind. He gave me advice and helped me along the road to becoming what I wanted to become.

Source: Who Is Man? (1965), Ch. 5<!-- Existence and expediency, p. 85 -->
Context: Man is naturally self-centered and he is inclined to regard expediency as the supreme standard for what is right and wrong. However, we must not convert an inclination into an axiom that just as man's perceptions cannot operate outside time and space, so his motivations cannot operate outside expediency; that man can never transcend his own self. The most fatal trap into which thinking may fall is the equation of existence and expediency.

Enchantment (1999)

Part I, ch. 5.
The Compleat Angler (1653-1655)

Act IV, scene 1, line 53 (666).
Heauton Timorumenos (The Self-Tormentor)

Source: Jonathan Strange & Mr Norrell

Source: 2001: A Space Odyssey

Source: Gargantua and Pantagruel (1532–1564), Pantagruel (1532), Chapter 29 : How Pantagruel discomfited the three hundred Giants armed with free-stone, and Loupgarou their Captain (Loup-garou is the french term for werewolf).