“Casual murder, casual suicide, casual crime. Why not? If alternate universes are a reality, then cause and effect are an illusion. The law of averages is a fraud. You can do anything, and one of you will, or did.”
All the Myriad Ways (p. 79)
Short fiction, N-Space (1990)
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Larry Niven 138
American writer 1938Related quotes

Quoted in Newsweek, December 10, 1973, p. 75.
“How do you explain to yourself the casual manner in which you threw your life away?”
Source: Swan Peak

“A casual stroll through the lunatic asylum shows that faith does not prove anything.”

“Do you want to have sex? I think we should have sex. CASUAL sex.”
Source: Scott Pilgrim, Volume 6: Scott Pilgrim's Finest Hour

Introduction.
Warped Passages: Unraveling the Universe's Hidden Dimensions (2005)