Nevertheless, with all its advantages, such a philosophy of life, like the corresponding system of life itself, is not ultimate truth: it remains an attempt, a problem which, ever anew, divides men into opposing camps. For the experience of history teaches us that the effort after concentration and an inner synthesis of life does not follow one clear, direct course throughout, but that different possibilities offer themselves and, in course of time, struggle upwards to reality. Different systems thus advance by the side of and in opposition to one another, each making the claim to undivided supremacy, to a superiority over all others. Philosophies of life now become means and instruments to justify and to establish such claims. They must enter into the severest conflict one with another, and the strife keeps up a powerful tension and pressure because here, by means of the ideas, tendencies of life compete with one another; because not mere representations of reality but realities themselves struggle together. It is manifest from the existence of these last problems that we do not grow up in a finished world, but have first to form and build up our world. We are concerned not merely with interpreting a given reality, but first of all with winning the true, primary, and all-comprehensive reality. By this our life is made uncertain and laborious, but it is raised at the same time to an inner freedom and a more genuine independence. And now for the first time we see in its true light the fact that its own views of life can become inadequate to an age. For the fact that an age lacks an inner unity, that cogent reasons drive it beyond the extant syntheses, is now a sign that it is not clear and certain as to its own life. To open up a way for a new synthesis, to organise life more adequately, becomes the most pressing of all demands, the question of questions. Even the most cautious and most subtle reflection will not lead us far in this matter; all hope of success depends upon our life containing greater depths, which hitherto have not been fully grasped, and more especially upon a transcendent unity present in it, which hitherto has not come to complete recognition. All thought and reflection is thus called to direct itself to the comprehension of such depths and of such a unity. Everything here depends on facts; on facts, however, which do not come to us opportunely from without, but which reveal themselves only to the eye of the spirit and to aspiration. I. STATEMENT AND CRITICISM OF INDIVIDUAL SYSTEMS OF LIFE