The remark of Andrew Carnegie that he won his success because he had the knack of picking the right men has become a classic in current speech. Augustus Caesar built up and extended the power of the Roman Empire because he knew men. The careers of Charlemagne, Napoleon, Disraeli, Washington, Lincoln, and all the empire builders and empire saviours hold their places in history because these men knew how to recognize, how to select, and how to develop to the highest degree the abilities of their co-workers. The great editors, Greeley, Dana, James Gordon Bennett, McClure, Gilder and Curtis, attained their high station in the world of letters largely because of their ability to unearth men of genius. Morgan, Rockefeller, Theodore N. Vail, James J. Hill, and other builders of industrial and commercial empires laid strong their foundations by almost infallible wisdom in the selection of lieutenants. Even in the world of sports the names of Connie Mack, McGraw, Chance, Moran, Carrigan and Stallings shine chiefly because of their keen judgment of human nature. If the glory that was Greece shone forth because Pericles kindled its flame, then Pericles in any time and amongst any people would probably have ushered in a Golden Age. Had Carnegie lived in any other day and sought his industrial giants, he would no doubt have found them. If a supreme judge of latent talent and inspirer of high achievement can thus always find material ready to his hand, it follows that humanity is rich in undiscovered genius--that, in the race, there are, unguessed and undeveloped, possibilities for a millennium of Golden Ages. Psychologists tell us that only a very small percentage of the real ability and energy of the average man is ever developed or used. "Poor man!" says a reviewer, speaking of a contemporary, "he never discovered his discoverer." The man who waits for his Pericles usually waits in vain. There has been only one Pericles in all history. Great geniuses in the discovery, development, and management of men are rare. Most men never meet them. And yet every man can discover his discoverer. Self-knowledge is the first step to self-development. Through an understanding of his own aptitudes and talents one may find fullest expression for the highest possibilities of his intellect and spirit. A man who thus knows himself needs no other discoverer. The key to self-knowledge is intelligent, scientific self-study.