The most important success principle of all was stated by Elbert Hubbard, one of the most prolific writers in American history, at the beginning of t… - Brian Tracy

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The most important success principle of all was stated by Elbert Hubbard, one of the most prolific writers in American history, at the beginning of the twentieth century. He said, ‘Self-discipline is the ability to do what you should do, when you should do it, whether you feel like it or not.