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. Two trees growing near each other adapt to enhance each other's survival. A strong image of durability is a stable marriage of intimate partners 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 stay in the race; but only by deepening our sense of purpose can we develop the fortitude to win it.
Continuity is achieved through movement, not by keeping still. That which has ceased to grow is close to death. Stay active, but allow yourself time to stay in touch with your innermost thoughts and feelings.