When playing Russian roulette the fact that the first shot got off safely is little comfort for the next.
Source:'Personal Observations on Reliability of Shuttle.' Report of the Presidential Commission on the Space Shuttle Challenger Accident (Jun 6, 1986); later published in 'The Pleasure of Finding Things Out: The Best Short Works of Richard P. Feynman' edited by Jeffrey Robbins (ed. MJF Books, 1999), Page 155