To say that individuals make up society is trivial ; society is always composed of classes. It may be an exaggeration to assert the theory of class-conflict, but the existence of definite classes in a society is a fact. Their basis may differ. They may be economic or intellectual or social, but an individual in a society is always a member of a class. This is a universal fact and early Hindu society could not have been an exception to this rule, and, as a matter of fact, we know it was not.
