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Above all, there is no exception (though there are opportunities for exceptions) to this rule, that the idea of political superiority always resolves itself into the idea of psychological superiority, in those cases where the highest caste is at the same time the priestly caste, and in accordance with its general characteristics confers on itself the privilege of a title which alludes specifically to its priestly function. It is in these cases, for instance, that “clean” and “unclean” confront each other for the first time as badges of class distinction; here again there develops a “good” and a “bad,” in a sense which has ceased to be merely social. Moreover, care should be taken not to take these ideas of “clean” and “unclean” too seriously, too broadly, or too symbolically: all the ideas of ancient man have, on the contrary, got to be understood in their initial stages, in a sense which is, to an almost inconceivable extent, crude, coarse, physical, and narrow, and above all essentially unsymbolical