This use of concrete, tangible, intelligible images is a thing which has to pay its price. And the price which it has to pay is the price of appearing childish, absurd and ridiculous to the type of mind which advocates the exclusive use of the logical reason as the sole instrument of philosophical research. This price of appearing naive, childish and ridiculous has to be paid shamelessly and in full. The type of mind which exacts this price, which demands in fact that the concrete intelligible symbols of the philosophy of the complex vision should be regarded as childish and ridiculous, is precisely the type of mind for whom "truth" is a smoothly evolutionary affair, an affair of steady "progress," and for whom, therefore, the mere fact of an idea being "a modern idea" implies that it is "true" and the mere fact of an idea being a classical idea or a mediaeval idea implies that it is crude and inadequate if not completely "false." To the philosophy of the complex vision "truth" does not present itself as an affair of smooth and steady historical evolution but as something quite different from this--as a work of art, in fact, dependent upon the struggle of the individual soul with itself, and upon the struggle of "the souls of the sons of the universe" with themselves. And although the struggle of the souls of "the sons of the universe" towards a fuller clarifying of the mystery of life must be regarded as having its concrete tangible history in time and space, yet this history is not at all synonymous with what is usually called "progress." An individual human soul, the apex-thought of whose complex vision has attained an extraordinary and unusual rhythm, must be regarded as having approached nearer to the vision of "the sons of the universe" although such an one may have lived in the days of the patriarchs or in the Greek days or in the days of mediaevalism or of the renaissance, than any modern rationalistic thinker who is obsessed by "the latest tendencies of modern thought." The souls of "the immortals" must certainly be regarded as developing and changing and as constantly advancing towards the realization of their hope and premonition. But this "advance" is also, as we have seen, in the profoundest sense a "return," because it is a movement towards an idea which already is implicit and latent. And in the presence of this "advance," which is also a "return," all historic ages of individual human souls are equal and co-existent.