One idea which generally passes as characteristic of all that is religious, is that of the supernatural. By this is understood all sorts of things which surpass the limits of our knowledge; the supernatural is the world of the mysterious, of the unknowable, of the un-understandable. Thus religion would be a sort of speculation upon all that which evades science or distinct thought in general. "Religions diametrically opposed in their overt dogmas," said Spencer, "are perfectly at one in the tacit conviction that the existence of the world, with all it contains and all which surrounds it, is a mystery calling for an explanation"; he thus makes them consist essentially in "the belief in the omnipresence of something which is inscrutable."[27] In the same manner, Max Müller sees in religion "a struggle to conceive the inconceivable, to utter the unutterable, a longing after the Infinite."[28]
It is certain that the sentiment of mystery has not been without a considerable importance in certain religions, notably in Christianity. It must also be said that the importance of this sentiment has varied remarkably at different moments in the history of Christianity. There are periods when this notion passes to an inferior place, and is even effaced. For example, for the Christians of the seventeenth century, dogma had nothing disturbing for the reason; faith reconciled itself easily with science and philosophy, and the thinkers, such as Pascal, who really felt that there is something profoundly obscure in things, were so little in harmony with their age that they remained misunderstood by their contemporaries.[29] It would appear somewhat hasty, therefore, to make an idea subject to parallel eclipses, the essential element of even the Christian religion.
In all events, it is certain that this idea does not appear until late in the history of religions; it is completely foreign, not only to those peoples who are called primitive, but also to all others who have not attained a considerable degree of intellectual culture. When we see them attribute extraordinary virtues to insignificant objects, and people the universe with singular principles, made up of the most diverse elements and endowed with a sort of ubiquity which is hardly representable, we are undoubtedly prone to find an air of mystery in these conceptions. It seems to us that these men would have been willing to resign themselves to these ideas, so disturbing for our modern reason, only because of their inability to find others which were more rational. But, as a matter of fact, these explanations which surprise us so much, appear to the primitive man as the simplest in the world. He does not regard them as a sort of _ultima ratio_ to which the intellect resigns itself only in despair of others, but rather as the most obvious manner of representing and understanding what he sees about him. For him there is nothing strange in the fact that by a mere word or gesture one is able to command the elements, retard or precipitate the motion of the stars, bring rain or cause it to cease, etc. The rites which he employs to assure the fertility of the soil or the fecundity of the animal species on which he is nourished do not appear more irrational to his eyes than the technical processes of which our agriculturists make use, for the same object, do to ours. The powers which he puts into play by these diverse means do not seem to him to have anything especially mysterious about them. Undoubtedly these forces are different from those which the modern scientist thinks of, and whose use he teaches us; they have a different way of acting, and do not allow themselves to be directed in the same manner; but for those who believe in them, they are no more unintelligible than are gravitation and electricity for the physicist of to-day. Moreover, we shall see, in the course of this work, that the idea of physical forces is very probably derived from that of religious forces; then there cannot exist between the two the abyss which separates the rational from the irrational. Even the fact that religious forces are frequently conceived under the form of spiritual beings or conscious wills, is no proof of their irrationality. The reason has no repugnance _a priori_ to admitting that the so-called inanimate bodies should be directed by intelligences, just as the human body is, though contemporary science accommodates itself with difficulty to this hypothesis. When Leibniz proposed to conceive the external world as an immense society of minds, between which there were, and could be, only spiritual relations, he thought he was working as a rationalist, and saw nothing in this universal animism which could be offensive to the intellect.