The other sciences, including Philosophy, have also an external history like Religion. Philosophy has a history of its origin, diffusion, maturity, decay, revival; a history of its teachers, promoters, and of its opponents—often, too, of an outward relation to religion and occasionally to the State. This side of its history likewise gives occasion to interesting questions. Amongst other such, it is asked why Philosophy, the doctrine of absolute Truth, seems to have revealed itself on the whole to a small number of individuals, to special nations, and how it has limited itself to particular periods of time. Similarly with respect to Christianity, to the Truth in a much more universal form than the philosophical, a difficulty has been encountered in respect to the question whether there is a contradiction in the fact that this religion should have appeared so late in time, and that it should have remained so long and should still remain limited to special races of men. But these and other similar questions are too much a matter of detail to depend merely on the general conflict referred to, and when we have further touched upon the peculiar character of philosophic knowledge, we may go more specially into the aspects which relate to the external existence and external history of Philosophy. But as regards the comparison between the history of Religion and that of Philosophy as to inner content, there is not in the latter as there is in Religion a fixed and fundamental truth which, as unchangeable, is apart from history. The content of Christianity, which is Truth, has, however, remained unaltered as such, and has therefore little history or as good as none.[2] Hence in Religion, on account of its very nature as Christianity, the conflict referred to disappears. The errors and additions constitute no difficulty. They are transitory and altogether historical in character. The other sciences, indeed, have also according to their content a History, a part of which relates to alterations, and the renunciation of tenets which were formerly current. But a great, perhaps the greater, part of the history relates to what has proved permanent, so that what was new, was not an alteration on earlier acquisitions, but an addition to them. These sciences progress through a process of juxtaposition. It is true that in Botany, Mineralogy, and so on, much is dependent on what was previously known, but by far the greatest part remains stationary and by means of fresh matter is merely added to without itself being affected by the addition. With a science like Mathematics, history has, in the main, only the pleasing task of recording further additions. Thus to take an example, elementary geometry in so far as it was created by Euclid, may from his time on be regarded as having no further history.