Good physical development not only gives strength and skill in the use of the body, but develops a physiological habit of surplus power that may be called quantity of energy. Life is not alone in quality, in delicacy of adjustment, in accuracy, in fineness of feeling; it is also in quantity. The poet who, with frail physique and feeble pulse, sits in his quiet retreat and puts his fine fancies into the rhythms of verse has quality. But in the stress and rivalry of life that awaits the majority of men, there is a need for quantity of energy, such as enabled a Washington or a Caesar or a Napoleon or a Wellington to shoulder his way through difficulties. These men combined quality with quantity and this combination may make, and often does make, the life of masterful achievement. The quantity of energy in us average men may make the difference between success and failure. Many men fail in life for lack of staying power, for lack of that kind of endurance that is furnished by having power in reserve. The strong, confident person who has strength to spare, reserves of energy, does his work easily and without friction. Half the timidities and indecisions of men are chargeable less to lack of ability than to lack of the physical vigor, the QUANTITY of energy, which is the driving power of character. In all the contests of life an important element in success is the ability to endure prolonged stress, to have the reserve energy that can be drawn upon and utilized as a driving force. This power is not alone necessary in the emergencies, the "short hauls" of life, but also in the long hauls that spread the strain through greater periods. Many of the failures of life are due as much to lack of ability to meet prolonged stress as to lack of experience or intelligence. Men of moderate ability but with great powers of endurance often succeed, while men of greater talent fail for lack of the ability to endure strain. The man with a weak body and without the self-confidence that surplus energy gives is liable to be of uncertain judgment. Such a man in the presence of a problem requiring quick decision, doubts and hesitates and stands shivering on the brink of action while hastening opportunities pass him by. Much of the loose thinking of our time is undoubtedly due to poor educational drill. In fact the failure of the schools to teach pupils how to apply the mind and how to think is one of their common reproaches. Inability to use the mind effectively is also frequently due to a lack of vigor and physical stamina. A person with poor digestion, or under-developed body, or weak circulation has of necessity a badly nourished brain. Such a brain, unless it belongs to a genius, will do poor thinking. The mentally trained person who is also physically strong has the combination that puts his powers at easy command. He can be joyously busy doing the impossible because the doing of it has been made easy by training.