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• The man who does things makes many mistakes, but he never makes the biggest mistake of all -- doing nothing.
  -- Benjamin Frankli...
• An expert is a man who has made all the mistakes which can be made, in a narrow field.
  -- Niels Bohr (1885-1962)...
• An expert is a man who has made all the mistakes which can be made, in a very narrow field.
  -- Niels Boh...
• The man who makes no mistakes does not usually make anything. Edward Phelp
• The man who makes no mistakes does not usually make anything.
  -- William Connor Magee, bishop of Peterborough...
• An expert is a person who avoids the small errors while sweeping on to the grand fallacy.
• The expert is a person who avoids the small errors as he sweeps on to the grand fallacy.
• A bachelor is a man who never makes the same mistake once. -- Ed Wy
• The only man who never makes a mistake is the man who never does anything. -- Theodore Roosevel