The fight for the open society began again only with the ideas of 1789; and the feudal monarchies soon experienced the seriousness of this danger. When in 1815 the reactionary party began to resume its power in Prussia, it found itself in dire need of an ideology. Hegel was appointed to meet this demand, and he did so by reviving the ideas of the first great enemies of the open society, Heraclitus, Plato, and Aristotle.
