<Li> "Nothing has to be true, but everything has to sound like it was ." </Li> <Li> "Never let your sense of morals prevent you from doing what is right ." </Li> <P> His best - known maxim, "Violence is the last refuge of the incompetent", became one of Isaac Asimov's favorite sayings . </P>

Who said violence is the last refuge of the incompetent
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