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True confidence is the realization that when things are challenging, you know that you have the internal resources not only to cope with those times but to overcome them with time, effort and persistence. Confidence is a feeling, but it comes and goes. It is drained when players fail to meet their often unrealistic expectations. It is improved by thinking good thoughts and remembering past successes. A negative thought never leads to a positive result.
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Bob Tewksbury (Ninety Percent Mental: An All-Star Player Turned Mental Skills Coach Reveals the Hidden Game of Baseball)