In fact, conformably to the slow rise of the democratic social order (and its cause, the blending of the blood of masters and slaves), the originally noble and rare impulse of the masters to assign a value to themselves and to "think well" of themselves, will now be more and more encouraged and extended; but it has at all times an older, ampler, and more radically ingrained propensity opposed to it--and in the phenomenon of "vanity" this older propensity overmasters the younger.

The vain person rejoices over EVERY good opinion which he hears about himself (quite apart from the point of view of its usefulness, and equally regardless of its truth or falsehood), just as he suffers from every bad opinion: for he subjects himself to both, he feels himself subjected to both, by that oldest instinct of subjection which breaks forth in him .-- It is "the slave" in the vain man's blood, the remains of the slave's craftiness--and how much of the "slave" is still left in woman, for instance!--which seeks to SEDUCE to good opinions of itself; it is the slave, too, who immediately afterwards falls prostrate himself before these opinions, as though he had not called them forth .-- And to repeat it again: vanity is an atavism.
262.

A SPECIES originates, and a type becomes established and strong in the long struggle with essentially constant UNFAVOURABLE conditions.

On the other hand, it is known by the experience of breeders that species which receive super-abundant nourishment, and in general a surplus of protection and care, immediately tend in the most marked way to develop variations, and are fertile in prodigies and monstrosities (also in monstrous vices).

Now look at an aristocratic commonwealth, say an ancient Greek polis, or Venice, as a voluntary or involuntary contrivance for the purpose of REARING human beings; there are there men beside one another, thrown upon their own resources, who want to make their species prevail, chiefly because they MUST prevail, or else run the terrible danger of being exterminated.