The object of these chapters is to discover how far the data of modern psychology can be put to use by each of us in furthering what is really the central concern of our lives. That central concern is the same whether we be teachers, writers, parents, merchants, statesmen, preachers, or any other of the thousand and one types into which civilization has divided us. In each case, the same essential problem confronts us. If we cannot solve it, we are failures; if we can, we are, successes. What is this central problem? Obviously, it is to be, in some worthwhile manner, effective within our human environment.