With reference to practical social doctrines, our method permits and commands the same independence. Sociology thus understood will be neither indivi… - Émile Durkheim

Nowadays, the phenomenon (of division of labor) has developed so generally it is obvious to all. We need have no further illusions about the tendencies of modern industry; it advances steadily towards powerful machines, towards great concentrations of forces and capital, and consequently to the extreme division of labor. Occupations are infinitely separated and specialized, not only inside the factories, but each product is itself a specialty dependent upon others. Adam Smith and John Stuart Mill still hoped that agriculture, at least, would be an exception to the rule, and they saw it as the last resort of small-scale industry. Although one must be careful not to generalize unduly in such matters, nevertheless it is hard to deny today that the principal branches of the agricultural industry are steadily being drawn into the general movement. Finally, business itself is ingeniously following and reflecting in all its shadings the infinite diversity of industrial enterprises; and, while this evolution is realizing itself with unpremeditated spontaneity, the economists, examining its causes and appreciating its results, far from condemning or opposing it, uphold it as necessary. They see in it the supreme law of human societies and the condition of their progress.

The category of class was at first indistinct from the concept of the human group; it is the rhythm of social life which is at the basis of the category of time; the territory occupied by the society furnished the material for the category of space; it is the collective force which was the prototype of the concept of efficient force, an essential element in the category of causality.

At the roots of all our judgments there are a certain number of essential ideas which dominate all our intellectual life; they are what philosophers since Aristotle have called the categories of the understanding: ideas of time, space, class, number, cause, substance, personality, etc. They correspond to the most universal properties of things. They are like the solid frame which encloses all thought: this does not seem to be able to liberate itself from them without destroying itself.