The socialistic system of life is often closely bound up with the naturalistic, and blends with it so well as almost to form a single whole; indeed, there is so much affinity in their fundamental principles that the one may appear to be the completion of the other. But when we come to details, we find that a different character and a different emotional life are yielded according as the relation to nature or to human society governs life; especially as we are parts in an infinite nature, or as we place our own province in the foreground and seek a new form for it. On the one hand knowledge takes the lead, on the other activity. While the former, according to its nature, is more concerned with reaching a consistent whole, the latter feels the contradictions of experience most intensely. With the one progress appears to be a gradual accumulation, with the other it does not seem possible to dispense with a radical change; while the former is broader in its outlook, the latter has more warmth of enthusiasm. Through the domination of thought and life by the problems of society, a distinctive form of culture may therefore be expected. In modern life different motives have led to a closer unity of men on the basis of experience. Religion no longer accords to the individual firm support as in earlier times, and with every advance of scientific research nature is removed inwardly further from us; ceaseless criticism and reflection tend to prevent us more and more from comprehending the whole as a unity. Man, thus isolated in the whole, seems to himself to be lost, unless he succeeds in discovering relations between himself and others of the same nature as himself, and unless in co-operation with them he helps to build up an independent realm of their own, which may lend support and value to the life of the individual.