"Don't let fear of failure discourage you. Don't let the voice of critics paralyze you - whether that voice comes from the outside or the inside."

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I came to realize that exaggerated concern about what others are doing can be foolish. It can paralyze effort, and stifle a good idea. One finds that in the history of science, almost every problem has been worked out by someone else. This should not discourage anyone from pursuing his own path.

— Theodore von Karman