THE NECESSITY FOR THE CONTROL OF INSTINCT. The human being's original equipment of impulses and needs constitutes at once an opportunity and a problem. Instincts are the natural resources of human behavior, the raw materials of action, feeling, and thought. All behavior, whether it be the "making of mud pies or of metaphysical systems," is an expression, however complicated and indirect, of some of the elements of the native endowments of human beings. Instinctive tendencies are, as we have seen, the primary motives and the indispensable instruments of action. Without them there could be no such thing as human purpose or preference; without their utilization in some form no human purpose or preference could be fulfilled. But like other natural resources, men's original tendencies must be controlled and redirected, if they are to be fruitfully utilized in the interests of human welfare. There are a number of conditions that make imperative the control of native tendencies. The first of these is intrinsic to the organization of instincts themselves. Human beings are born with a plurality of desires, and happiness consists in an equilibrium of satisfactions. But impulses are stimulated at random and collide with one another. Often one impulse, be it that of curiosity or pugnacity or sex, can be indulged only at the expense or frustration of many others just as natural, normal, and inevitable. There is a certain school of philosophical radicals who call us back to Nature, to a life of unconsidered impulse. They paint the rapturous and passionate moments in which strong human impulses receive satisfaction without exhibiting the disease and disorganization of which these indulgences are so often the direct antecedents. A life is a long-time enterprise and it contains a diversity of desires. If all of these are to receive any measure of fulfillment there must be compromise and adjustment between them; they must all be subjected to some measure of control.