In the course of the following treatise, I have remarked that even Plato's Republic, a proverbial example of an empty ideal, is essentially the embodiment of nothing other than the nature of Greek ethics; and Plato, aware that the ethics of his time were being penetrated by a deeper principle which, within this context, could appear immediately only as an as yet unsatisfied longing and hence only as a destructive force, was obliged, in order to counteract it, to seek the help of that very longing itself.