make their species prevail, chiefly because they MUST prevail, or else run the terrible danger of being exterminated. The favour, the super-abundance, the protection are there lacking under which variations are fostered; the species needs itself as species, as something which, precisely by virtue of its hardness, its uniformity, and simplicity of structure, can in general prevail and make itself permanent in constant struggle with its neighbours, or with rebellious or rebellion-threatening vassals.

The most varied experience teaches it what are the qualities to which it principally owes the fact that it still exists, in spite of all Gods and men, and has hitherto been victorious: these qualities it calls virtues, and these virtues alone it develops to maturity. It does so with severity, indeed it desires severity; every