Leadership is the activity of influencing people to cooperate toward some goal which they come to find desirable. The art of leadership (1935)
Almost every study of the secret of the successful leader has agreed that the possession of a generous and unusual endowment of physical and nervous energy is essential to personal ascendancy. Those who rise in any marked way above the mass of men have conspicuously more drive, more sheer endurance, greater vigor of body and mind than the average person The art of leadership (1935)