But it would be a complete error to believe that the writers who narrate, explain, or illustrate have themselves invented and given life to this enormous mass of unripe concepts, imaginings, and explanations which, thanks to the force of prejudice, concealed for centuries the real truth. It may happen, and it certainly does happen, that some of these concepts are the fruit and the product of personal views, or of literary currents formed in the narrow professional circle of the universities and academies. The people in this case are absolutely ignorant of them. But the important fact is that history itself has put on these veils; that is to say, that the very actors and workers of the historic events--great masses of people, directing and ordering classes, masters of state, sects or parties, in the narrowest sense of the word, if we make exception for an occasional moment of lucid interval--never had up to the end of the past century a consciousness of their own work, unless it be through some ideological envelope which prevented any sight of the real causes. Already at the distant epoch when barbarism was passing over into civilization, that is to say, when the first discoveries of agriculture, the stable establishment of a population upon a definite territory, the first division of labor in society, the first alliances of different gentes, gave the conditions in which developed property and the state, or at least the city,--even then, at the epoch of all the first social revolutions, men ideally transformed their work, seeing in it the miraculous acts of gods and heroes. So much so that, while acting as they could and as they must, granted the necessity and the fact of their relative economic development, they conceived an explanation of their own work as if it did not belong to them. This ideological envelope of human works has changed since then more than once in form, in appearance, in combinations and in relations in the course of the centuries, from the immediate production of the ingenuous myths up to the complicated theological systems and to _The City of God_ of St. Augustine--from the superstitious credulity in miracles down to the bewildering miracles of the metaphysicians, that is to say, down to the _Idea_ which for the _decadents_ of Hegelianism engenders of itself, in itself, by its own disaggregation the most incongruous variations of social life in the course of history. Now, precisely because the visual angle of ideological interpretation has not been finally outgrown until very lately, and because it is only in our days that a sum total of the real and really acting relations has been clearly distinguished from the ingenuous reflections of myth and the more artificial reflections of religion and metaphysics, our doctrine states a new problem and carries within itself grave difficulties for whoever wishes to fit it for providing a specific explanation of the history of the past.