“In any given moment, a man’s growth is optimized if he leans just beyond his edge, his capacity, his fear.  He should not be too lazy, happily stagnating in the zone of security and comfort.  Nor should he push far beyond his edge, stressing himself unnecessarily, unable to metabolize his experience.  He should lean just slightly beyond the edge of fear and discomfort.  Constantly.  In everything he does.” ~ David Deida, The Way of the Superior Man