 Founding social science therefore constitutes a turn in the history of humanity. Until then, the positive spirit was characterized by the objective method, which works its way from the world to man; but as this goal has now been reached, it becomes possible to invert that direction and go from man to world, to adopt, in other words, the subjective method, which so far had been associated with the anthropomorphism of theology. To legitimize that method, it suffices to substitute sociology for theology, — which is equivalent to substituting the relative for the absolute: whereas God may say to the soul, as in the Imitatio, “I am necessary to you and you are useless to me”,  Humanity[3]  is the most dependent of all beings. In the first case, to say that God need us is blasphemy: it would be denying his perfection. The second case is in some respects a mere consequence of the classification of sciences, if we agree to consider humanity as the proper object of sociology. Each science depends on the precedent; as the final science, sociology is the most dependent one. Human life depends for instance on astronomical conditions. Humanity depends also on each of us, on what we do and not do; on another sense, of course, each of us depends on humanity, as said by the law of human order: les vivants sont nécessairement et de plus en plus gouvernés par les morts.