In the beginning, not only moral and religious life, but civil and political life, rested upon the grossest errors, on absolute monarchy, divine right, caste, and slavery; all this barbarity possessed a certain utility, but its utility precisely consisted in its leading to its own extinction; it served as a means of handing us on to something better. What distinguishes the living mechanism from other mechanisms is that the outer springs precisely labour to cause themselves to be superseded; that the movement once produced is perpetual. If we possessed means of projection powerful enough to rival those of nature, we might convert a cannon ball into an eternal satellite of the earth, without its being necessary to impart movement to it a second time. A result accomplished in nature is accomplished once for all. A step forward if it is real and not illusory, and in especial if it is completely conscious, renders impossible a step backward. [6] See pt. 2, chap. iv. In the eighteenth century the attack on religion was directed by philosophical partisans of _a priori_ principles, who were persuaded that the instant a faith was proved to be absurd that was the end of it. In our days the attack is led by historians who possess an absolute respect for fact, which they are inclined to erect into a law, historians who pass a learned existence in the midst of absurdity in all its forms, and for whom the irrational, instead of condemning a belief in which it appears, is often a condition of its duration. Therein lies the difference between the attitude of the eighteenth century and that of the nineteenth toward religion. The eighteenth century hated religion and wished to destroy it. The nineteenth century endeavours to understand religion and cannot reconcile itself to seeing so charming an object of study disappear. The historian’s device is, “What has been, will be”; he is naturally inclined to model his conception of the future on his knowledge of the past. A witness of the futility of revolutions, he sometimes forgets that complete evolution is possible: an evolution which transforms things to their very roots and metamorphoses human beings and their beliefs to an extent that renders them unrecognizable.[7]