For an ideology differs from a simple opinion in that it claims to possess either the key to history, or the solution for all the "riddles of the universe," or the intimate knowledge of the hidden universal laws which are supposed to rule nature and man. Few ideologies have won enough prominence to survive the hard competitive struggle of persuasion, and only two have come out on top and essentially defeated all others: the ideology which interprets history as an economic struggle of classes, and the other that interprets history as a natural fight of races. The appeal of both to large masses was so strong that they were able to enlist state support and establish themselves as official national doctrines. But far beyond the boundaries within which race-thinking and class-thinking have developed into obligatory patterns of thought, free public opinion has adopted them to such an extent that not only intellectuals but great masses of people will no longer accept a presentation of past or present facts that is not in agreement with either of these views.

The philosophy of Hobbes, it is true, contains nothing of modern race doctrines, which not only stir up the mob, but in their totalitarian form outline very clearly the forms of organization through which humanity could carry the prerequisite for all race doctrines, that is, the exclusion in principle of the idea of humanity which constitutes the sole regulating idea of international law. With the assumption that foreign politics is necessarily outside of the human contract, engaged in the perpetual war of all against all, which is the law of the "state of nature," Hobbes affords the best possible theoretical foundation for those naturalistic ideologies which hold nations to be tribes, separated from each other by nature, without any connection whatever, unconscious of the solidarity of mankind and having in common only the instinct for self-preservation which man shares with the animal world. If the idea of humanity, of which the most conclusive symbol is the common origin of the human species, is no longer valid, then nothing is more plausible than a theory according to which brown, yellow, or black races are descended from some other species of apes than the white race, and that all together are predestined by nature to war against each other until they have disappeared from the face of the earth.