Human nature (n.) is "human" only insofar as it opens the possibility of becoming something highly unnatural — a man.
Human nature (n.) is something we could no more define than jump over our own shadows; if we have one, only a god could know it.
Human nature (n.) in general does not exist; what exists is the essence of who someone is, and it comes into being only when life departs, leaving a story.
Human nature (n.) in Hobbes is drawn backward from the state: he depicts man according to the needs of the Leviathan, a sketch of the new type who would fit bourgeois society.
Human nature (n.) ends up as a god whenever philosophers try to define it — the god of the philosophers, who turns out to be a Platonic idea of man.
Human nature (n.) itself — not society, not the outside world — is what totalitarian ideologies aim to transform; the camps are where the changes are tested, and so their shame concerns all men.