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An expert is one who knows more and more about less and less.

An expert is someone who knows a lot about the past.

An expert is someone who has succeeded in making decisions and judgements simpler through knowing what to pay attention to and what to ignore.

An expert is a man who has made all the mistakes which can be made, in a narrow field.

An expert is someone who knows some of the worst mistakes, which can be made, in a very narrow field.

An expert gives an objective view. He gives his own view.

You never have to know all the answers because you won't be asked all the questions.

Expert: a man who makes three correct guesses consecutively.