“ None of our men are "experts." We have most unfortunately found it necessary to get rid of a man as soon as he thinks himself an expert—because no one ever considers himself expert if he really knows his job. ”
 Henry Ford, My Life and Work (1922). copy citation

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“Then, too, a record of failures—particularly if it is a dignified and well-authenticated record—deters a young man from trying. We get some of our best results from letting fools rush in where angels fear to tread. None of our men are "experts." We have most unfortunately found it necessary to get rid of a man as soon as he thinks himself an expert—because no one ever considers himself expert if he really knows his job. A man who knows a job sees so much more to be done than he has done, that he is always pressing forward and never gives up an instant of thought to how good and how efficient he is. Thinking always ahead, thinking always of trying to do more, brings a state of mind in which nothing is impossible.” source