If you believe you can, you probably can. If you believe you won't, you most assuredly won't. Belief is the ignition switch that gets you off the launching pad.
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.