Also, you might as well train your children to it. You will find you cannot develop their powers to the fullest without competition; in fact, you will be forced to go back and utilize forms of competition which are now out of date among adults. I have told in the Book of the Body how I myself tried for ten years or more to live without physical competition, and discovered that I could not; I have had to take up some form of sport, and hundreds of thousands of other men have had the same experience. What is sport? It is a deliberate going back, under carefully devised rules, to the savage struggles of our ancestors. The very essence of real sport is that the contestants shall, within the rules laid down, compete with each other to the limit of their powers. With what contempt would a player of tennis or baseball or whist regard the proposition that his opponent should be merciful to him, and let him win now and then! Obviously, these things have no place in the game, and to be a "good sport" is to conform to the rules, and take with enjoyment whatever issue of the struggle may come. But then again, suppose you are competing with a child; obviously, the conditions are different. You no longer play the best you can, you let the child win a part of the time; but you do not let the child know this, or it would spoil the fun for the child. You pretend to try as hard as you know how, and you cry out in grief when you are beaten, and the child crows with delight. And yet, that does not keep you from loving the child, or the child from loving you. The purpose of this elaborate exposition is to make clear the very vital point that a certain set of social acts may be right under some conditions, and desperately wrong under other conditions. They may be right in play, and not in serious things; they may be right in youth, and not in maturity; they may be right at one period of the world's development, while at another period they are destructive of social existence. If, therefore, we wish to know what are right and wrong actions in the affairs of men, if we wish to judge any particular law or political platform or program of business readjustment, the first thing we have to do is to acquire a mass of facts concerning the society to which the law or platform or program, is to be applied. We need to ask ourselves, exactly what will be the effect of that change, applied in that particular way at that particular time. In order to decide accurately, we need to know the previous stages through which that society has passed, the forces which have been operating in it, and the ways in which they have worked.