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what I have long believed, that Man is the possessor of unlimited power. Beyond the fatigue where one seems completely spent, there higher levels of energy waiting to be tapped, what is needed to tap them is the sharply pressing edge of a persistent purpose, the MENTAL act of PUSHING ON

Right here let me enter a word of caution. I would not advise you to push beyond the fatigue point physically until you are prepared for it mentally, for if you do there is danger of collapse or even death. You must first me fully convinced that you can tap higher levels of Energy. There must first be the MENTAL ACT of PUSHING ON, and it must be made a habit before you can safely try the PHYSICAL PUSH beyond the fatigue point. You must establish within yourself a steady, unconquerable purpose to PUSH ON.

Professor James enumerates the various excitements that produce the second wind, and I notice they are in the ultimate either thoughts or emotions. He also explains that there need be no external excitement, that the determination to PUSH ON is often quite sufficient. I will quote his words in this connection:

On usual occasions we make a practice of stopping an occupation as soon as we meet the effective layer, so to call it, of fatigue. We have then walked, played or worked enough, so we desist. That amount of fatigue is an efficacious obstruction on this side of which our life is cast. But if an unusual necessity