Nietzsche's The Genealogy of Morals, Preface: Why we Should Question Morality. 

On the Genealogy of Morality is an 1887 book by German philosopher Friedrich Nietzsche. It consists of a preface and three interrelated treatises that expand and follow through on concepts Nietzsche sketched out in Beyond Good and Evil (1886). The three treatises trace episodes in the evolution of moral concepts with a view to confronting "moral prejudices," specifically those of Christianity and Judaism.
Nietzsche's book outlines his thoughts "on the origin of our moral prejudices" previously given brief expression in his Human, All Too Human (1878) and Beyond Good and Evil (1886). Nietzsche attributes the desire to publish his "hypotheses" on the origins of morality to reading his friend Paul Rée's book The Origin of the Moral Sensations (1877) and finding the "genealogical hypotheses" offered there unsatisfactory.
Nietzsche decided that "a critique of moral values" was needed, that "the value of these values themselves must be called into question."

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