and of establishing a distinctive whole of life. The exact significance of spiritual self-preservation is for the present obscure enough; but whatever it may be, it derives its power from within and not from contact with the environment. How deeply these inner movements are rooted in human life the so-called historical ideas show with particular clearness. Certain thought complexes, or rather certain tendencies of life, arise, and win an overwhelming power in opposition to all narrowly human concerns. They force the activity of mankind into particular channels; they follow out their consequences with pitiless rigour; they speak to us in a tone of command, and require absolute obedience. Neither the interests of individuals nor those of whole classes prevail against them; every consideration of utility vanishes before their inner necessity. The history of religions, for example, has often shown such an astonishing consistency in the following of characteristic tendencies that their adherents could see in it the working of a divine spirit. Similarly, the Enlightenment, in its time with overpowering might seized minds and penetrated deeply into every department of life; to-day we have a similar experience in the case of the social movement. On all sides something is acknowledged as an imperative requirement, as indispensable for the spiritual persistence of man--something which cannot be brought in from outside, and which may indeed be entirely inconsistent with external conditions. Has not the conflict of inner necessities with the external circumstances that were opposed to them been a leading motive power in history, and is not all genuine progress achieved through such an opposition?