New formations step into the place of the old ones, and the members of these groups carry on the struggle for existence in common against other peoples. In equal ratio with economic development, the size of these unions increases, the struggle of each against the other decreases, and social feelings spread. At the end of ancient times we find that all the people known then formed a unit, the Roman Empire, and at that time arose the theory—the moral feelings having their influence on almost all the people—which led to the maxim that all men are brothers.
When we regard our own times, we see that economically all the people form one unit, although a very weak one; nevertheless the abstract feeling of brotherhood becomes ever more popular. The social feelings are strongest among members of the same class, for classes are the essential units embodying particular interests and including certain members. Thus we see that the social units and social feelings change in human society. These changes are brought about by economic changes, and the higher the stage of economic development, the higher and nobler the social feelings.
VIII. TOOLS, THOUGHT AND LANGUAGE.
Sociability, with its consequences, the moral feelings, is a peculiarity which distinguishes man from some, but not from all, animals. There are, however, some peculiarities which belong to man only, and which separate him from the entire animal world. These, in the first instance, are language, then reason. Man is also the only animal that makes use of self-made tools.
