[M]y friend Professor Tolkien asked me the very simple question, "What class of men would you expect to be most preoccupied with, and most hostile to, the idea of escape?" and gave the obvious answer: jailers.

"The only people who object to escapism are jailers." Mistakenly attributed solely to Lewis by Arthur C. Clarke in God, The Universe and Everything Else (1988). Also see Clarke's "Aspects of Science Fiction" in Greetings, Carbon-Based Bipeds!: Collected Essays 1934-1998 (New York: St. Martin's Press, 1999), edited by Ian T. Macauley