Human nature in this sense is justly regarded as a comparatively permanent element in society. Always and everywhere men seek honor and dread ridicule, defer to public opinion, cherish their goods and their children, and admire courage, generosity, and success. It is always safe to assume that people are and have been human. Human nature is not something existing separately in the individual, but a _group nature or primary phase of society_, a relatively simple and general condition of the social mind. It is something more, on the one hand, than the mere instinct that is born in us--though that enters into it--and something less, on the other, than the more elaborate development of ideas and sentiments that makes up institutions. It is the nature which is developed and expressed in those simple, face-to-face groups that are somewhat alike in all societies; groups of the family, the playground, and the neighborhood. In the essential similarity of these is to be found the basis, in experience, for similar ideas and sentiments in the human mind. In these, everywhere, human nature comes into existence. Man does not have it at birth; he cannot acquire it except through fellowship, and it decays in isolation.[55] 3. Classification of the Materials With the tacit acceptance by biologists, psychologists, and sociologists of human behavior as a natural phenomenon, materials upon human nature have rapidly accumulated. The wealth and variety of these materials are all the greater because of the diversity of the points of view from which workers in this field have attacked the problem. The value of the results of these investigations is enhanced when they are brought together, classified, and compared. The materials fall naturally into two divisions: (a) "The Original Nature of Man" and (b) "Human Nature and Social Life." This division is based upon a distinction between traits that are inborn and characters socially acquired; a distinction found necessary by students in this field. Selections under the third heading, "Personality and the Social Self" indicate the manner in which the individual develops under the social influences, from the raw material of "instinct" into the social product "the person." Materials in the fourth division, "Biological and Social Inheritance," contrast the method of the transmission of original tendencies through the germ plasm with the communication of the social heritage through education.