Don't dwell on what went wrong. Instead focus on what to do next. Spend your energies on moving forward toward finding the answer.
Denis E. Waitley (born 1933), is an American motivational speaker, writer and consultant. He has been recognized as the best-selling author of the audio series, The Psychology of Winning, and books such as "Seeds of Greatness" and "The Winner's Edge".
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Read more about Denis Waitley on Wikipedia.