Oh! the incidents all happened but — I'm not telling as much of the truth about them as I know.

Letter to Elizabeth Otis, expressing dissatisfaction with L'Affaire Lettuceburg — a satire he abandoned in favor of work on what became The Grapes of Wrath (c. mid-May 1938) as quoted in Conversations with John Steinbeck (1988) edited by Thomas Fensch, p. 38