The positive philosophy of history takes as its guiding principle the idea of unity. In virtue of a postulate which is an audacious anticipation concerning an uncertain future, the human species, in it, is regarded as an immense social unity. Similarly, in it, the evolution of humanity is regarded as ending in the moral and religious unity of all men. Humanity goes from spontaneous religion where it begins, to demonstrated religion where it becomes finally established. Between the two lies the domain of history. The successive states through which humanity passes in evolving are not homogeneous. The theological and the positive spirit are mingled in them at various degrees. They struggle one against the other. These states then contain within themselves the principle of their own destruction. Each one necessarily prepares the appearance of the following one, until the final state in which the positive spirit alone will predominate.

The spring of these concrete views of history is the logical need of unity. It is this which determined the initial movement. For the primitive religions, unity was never perfect. Even at the period when fetichism rules without question, some rudiments of the positive spirit exist. Human nature, being invariable, the germ of its final state was already contained in a primitive state. From that time it was certain that, if humanity emerged from its primitive state, it would evolve until it found unity in the final religion.

If this be so, how is it that Comte did not regard the succession of religious forms as the supreme dynamic law, as the principle of the philosophy of history? Why did he believe rather that he had found this principle in the law of the evolution of philosophies? It is because, according to him, the evolution of religious forms is a function of intellectual evolution. It is even subordinate to intellectual evolution, in this sense, that progress in the knowledge of the laws of nature sooner or later brings about a religious revolution. In the second place, if the philosophy of history had chosen the succession of religious forms as its chief axis, it would only have studied the process of decomposition of beliefs, which, up to the present time, has led them from the period when all thought is religious (fetichism), to that when no thought seems to be so any more (philosophical deism). It would not show at the same time the inverse and simultaneous process of the positive spirit, which not only determines this progressive decomposition, but also prepares the elements of a new faith. It would not show how by degrees, by means of science, this spirit establishes a conception of nature which by becoming social will become universal, and which will be the basis of the final religion. This is why Comte, while making religion the chief element in individual and social human life, was nevertheless to take the evolution of the intellect, that is to say, the sciences and the philosophies, as the “guiding thread” of his philosophy of history.

II.

It does not come within the purpose of this work to give even a summary outline of the philosophy of history developed by Comte first in the Cours de philosophie positive, and then in the third volume of the Politique positive. Neither shall we disengage the ingenious or profound views of detail with which it abounds. It will suffice for us to show how, according to Comte, the laws of social dynamics are always verified, and how apparent exceptions end by being interpreted in the direction of these laws.

Fetichism, properly so-called, was succeeded by astrology, then by polytheism, which was first conservative (the régime of castes in Egypt), then intellectual (Greece), and social (the Roman empire). With the Christian religion monotheism comes to be substituted to polytheism. But does not the theory of progress soon meet with an insurmountable obstacle? How does it explain the Middle Ages, that long succession of centuries which Voltaire and the philosophers had described as full of darkness, of superstition, and of ignorance, as the disgrace of history? How to reconcile this lamentable “retrogression” with the “continuity” of progress affirmed by social dynamics?

Auguste Comte’s answer is presented in two forms.

In the first place the “retrogression” was never complete. At the time when the Middle Ages were at their darkest in Europe, Arab civilisation was going through its most brilliant period. In it many of the sciences were going beyond the extreme point reached by them in antiquity. The continuity of evolution was then not interrupted. It suffices to understand, in conformity with the postulate laid down by Comte at the beginning of social dynamics, that, at this period, the Arabs were the part of humanity whose intellectual evolution was most advanced, and who, consequently, represented the rest.

But, above all, the current opinion concerning the Middle Ages is erroneous. The philosophers of the XVIII. century did not know it. They only saw this period through their prejudices, or rather they did not deign to look at it. Nevertheless, the whole spiritual movement of modern centuries goes back to those “memorable times, unjustly qualified as dark by metaphysical criticism, of which Protestantism was the first organ.”[288]

In the first place—and this is a capital proposition in historical philosophy[289]—the feudal régime as a temporal organisation, was the natural result of the situation of the Roman world. In any case it would have been formed, even if the invasions had not taken place. In virtue of the consensus which is the fundamental principle of social statics, the other series of phenomena which accompanied the establishment of the feudal régime were then also produced as a “natural development,” and it is a misunderstanding to see in them an interruption of “progress.” The superiority of Antiquity over the Middle Ages, especially in the fine arts, will be raised as an objection. But Comte only recognises this superiority in the plastic arts, and especially in sculpture.[290] According to him, it is explained by certain features in Greek customs which were sure to make the people of antiquity incomparable in the art of expressing the beauty of the human form. For the rest, the æsthetic education of humanity “progressed during the Middle Ages. Architecture produced marvels of which antiquity had no idea. Dante is a unique poet. Modern music has its origin in the old Gregorian. Finally, the art of the Middle Ages presented two characteristics which the art of the aristocratic societies of antiquity did not possess, at least in the same degree. It was spontaneous, that is to say, in full natural harmony with the whole of the surrounding conditions. Consequently, it was popular, it expressed marvellously for the people, the very soul of the people.