Here's a good quote that I scrounged up that pretty much gets right to it:
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To use fear as the friend it is, we must retrain and reprogram ourselves...We must persistently and convincingly tell ourselves that the fear is here--with its gift of energy and heightened awareness--so we can do our best and learn the most in the new situation.
Peter McWilliams, Life 101
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)