On the Genealogy of Morality: A Polemic (Zur Genealogie der Moral: Eine Streitschrift) is an 1887 book by German philosopher Friedrich Nietzsche. It consists of a preface and three interrelated treatises ('Abhandlungen' in German) 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. Some Nietzsche scholars consider Genealogy to be a work of sustained brilliance and power as well as his masterpiece. Since its publication, it has influenced many authors and philosophers. Nietzsche's treatise 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". To this end Nietzsche provides a history of morality, rather than a hypothetical account in the style of Rée, whom Nietzsche classifies as an "English psychologist" (using "English" to designate an intellectual temperament, as distinct from a nationality). Good and evil In the "First Treatise", Nietzsche demonstrates that the two pairs of opposites "good/evil" and "good/bad" have very different origins, and that the word "good" itself came to represent two opposed meanings. In the "good/bad" distinction of the aristocratic way of thinking, "good" is synonymous with nobility and everything that is powerful and life-affirming; "bad" has no inculpatory implication and simply refers to the "common" or the "low" and the qualities and values associated with them, in contradistinction to the warrior ethos of the ruling nobility (§3).