Robert Pippin:

Nietzsche’s best-known attempt to break the hold that a philosophical or moral picture might have over us is genealogy. At least, genealogy can be liberating in this way if such a genealogy can show us that practices and norms could have been very much otherwise, that some assumption or norm we take for granted as inevitable and unavoidable in fact has a contingent, quite avoidable origin, and an origin considerably more complicated than any notion of “rational commitments” or “reflective endorsement” or “faith in revelation” or the like would allow.