Endurance is fostered when inner constancy is coupled with external flexibility. Long-distance runners must adapt readily to changing conditions, while maintaining an inner determination and strength of purpose. The image of endurance is a stable marriage: a man and woman striking a dynamic balance between involvement in the outside world and nourishment in the home.
True endurance is not based on rigidity, for endurance implies movement, not immobilization. Only by adapting to change can we can we stay in the race; but only by deepening our sense of purpose can we develop the fortitude to win it.
