“Discipline is the spark that ignites the fire of a habit.  Those fires must be lit daily, and discipline provides the original source energy.  The word discipline literally means to be a disciple to a higher purpose.  Developing the discipline to train hard every day means you become a disciple—not to the training itself, not just to looking good or stroking your ego, but to the higher purpose of developing yourself fully as a human being and as a leader.” ~ Mark Divine, The Way of the Seal