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" "Cherish each hour of this day for it can never return.
Augustine "Og" Mandino (12 December 1923 – 3 September 1996) was a "sales guru" and author, most famous for his book The Greatest Salesman in the World (1968).
Biography information from Wikiquote
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The only certain means of success is to render more and better service than is expected of you, no matter what the task may be. This is a habit followed by all successful people since the beginning of time. Therefore I saith the surest way to doom yourself to mediocrity is to perform only the work for which you are paid.
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