“It was just as the 1914 War burst on me that I made the discovery that 'legends' depend on the language to which they belong; but a living language depends equally on the 'legends' which it conveys by tradition. … Volapuk, Esperanto, Ido, Novial, &c &c are dead, far deader than ancient unused languages, because their authors never invented any Esperanto legends…”

"How Do You Say ‘Billionaire’ in Esperanto?" in The New York Times (December 16, 2010) http://cityroom.blogs.nytimes.com/2010/12/16/how-do-you-say-billionaire-in-esperanto/

alt. religion. emacs http://groups.google.com/group/alt.religion.emacs/msg/991308e21103bb76

hence all the old tales of elfin Kingdoms moving further and further away from our world, or that magical beings require our faith, our belief in their existence, to survive. … That is a lie. All they require is our recognition.
Goninan in Part One: The Hidden People, "Border Spirit" p. 337
The Little Country (1991)

Quoted in Cade Metz, "Dennis Ritchie: The Shoulders Steve Jobs Stood On", http://www.wired.com/wiredenterprise/2011/10/thedennisritchieeffect/ Wired, 13 October 2011.

"A Philologist on Esperanto" in The British Esperantist (May 1932).
Years later, in a 1956 letter (quoted more extensively below) he stated that Esperanto and other constructed languages were "dead, far deader than ancient unused languages, because their authors never invented any Esperanto legends."

Book 3, Chapter 2 “The Destruction in the Fortress” (p. 260)
The Elric Cycle, The Fortress of the Pearl (1989)

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Usenet postings, 1990