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• 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 someone who knows some of the worst mistakes that can be made in his subject and how to avoid them.
  -- Werner Karl Heisenberg (1901-1976) German physici...
• An expert is someone who knows some of the worst mistakes that can be made in his subject and who manages to avoid them.
  William Heisenberg ['Der Teil und das Ganze', 1969]...
• Prediction is very difficult, especially of the future. -- Niels Boh
• Those who are not shocked by quantum theory do not understand it. -- Niels Boh
• The greatest of all mistakes is to think that you have never made any mistakes.
• Critical judgment of work in any given field has little value unless it comes from someone who is an expert in that field.
• We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct.
  My own feeling is that it is not crazy enough. -- Niels Boh...
• We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct.
  My own feeling is that it is not crazy enough. -- Niels Bohr (1885-1962) to Albert Einstei...