This is a principle I think about often. Your time, relationships, health, fitness, motivation, energy, drive, and even resources are not meant to be stored away in silos and barns. They are meant to be used, spent, depleted, pursued, and renewed. Because so many of these things are finite, I think we often swing too far toward preservation, which paradoxically allows them to deteriorate or lose their value. Tomorrow is not a certainty, and you cannot take these things with you when you are gone, so put what you have to work while it is still yours to give.