28. VARIETIES OF THE SOCIAL ORDER.--The social order into which he is thus ushered may be most varied in character. He may find himself a member of a small and primitive group of human beings, a family standing in more or less loose relations to a limited number of other families; he may belong to a clan in which family relationship still serves as a real or fictive bond; his clan may have its place in a confederation; or the body politic in which he is a unit may be a nation, or an empire including many nationalities. His relations to his fellow-man will naturally present themselves to him in a different light according to the different nature of the social environment in which he finds himself. The community of feeling and of interests which defines rights, determines expectations, and prescribes duties, cannot be the same under differing conditions. Social life implies cooperation, but the limits of possible cooperation are very differently estimated by man at different stages of his development. To a few human beings each man is bound closely at every stage of his evolution. The family bond is everywhere recognized. But, beyond that, there are wider and looser relationships recognized in very diverse degrees, as intelligence expands, as economic advance and political enlightenment make possible a community life on a larger scale, as sympathy becomes less narrow and exclusive. It is not easy for a member of a community at a given stage of its development even to conceive the possibility of such communities as may come into existence under widely different conditions. The simple, communistic savage, limited in his outlook, thinks in terms of small numbers. A handful of individuals enjoy membership in his group; he recognizes certain relations, more or less loose, to other groups, with which his group comes into contact; beyond is the stranger, the natural enemy, upon whom he has no claim and to whom he owes no duty. At a higher level there comes into being the state, including a greater number of individuals and internally organized as the simpler society is not. But even in a highly civilized state much the same attitude towards different classes of human beings may seem natural and inevitable. To Plato there remained the strongly marked distinctions between the Athenian, the citizen of another Hellenic community, and the barbarian. War, when waged against the last, might justifiably be merciless; not so, when it was war between Greek states. [Footnote: Republic, Book V.] Into such conceptions of rights and duties men are born; they take them up with the very air that they breathe, and they may never feel impelled to subject them to the test of criticism.