Walter Kaufmann (philosopher) in the context of "Ecce Homo (book)"

Authenticity is a concept of personality in the fields of psychology, existential psychotherapy, existentialist philosophy, and aesthetics. In existentialism, authenticity is the degree to which a person's actions are congruent with their values and desires, despite external pressures to social conformity. The conscious self comes to terms with the condition of Geworfenheit, of having been thrown into an absurd world (without values and meaning) not of their own making, thereby encountering external forces and influences different from and other than the Self. Authenticity has emerged as a central concept in contemporary models of well-being and the good life, serving as a foundational principle in many leading psychological frameworks. A person’s lack of authenticity is considered bad faith in dealing with other people and with one's self; thus, authenticity is in the instruction of the Oracle of Delphi: “Know thyself.” Concerning authenticity in art, the philosophers Jean Paul Sartre and Theodor Adorno held opposing views and opinions about jazz, a genre of American music; Sartre said that jazz is authentic and Adorno said that jazz is inauthentic. Many musical subcultures require artistic authenticity, lest the community consider an artist to be a poseur for lacking authenticity (creative, musical, or personal); artistic authenticity is integral to many genres of music, including but not limited to genres of rock (such as punk rock and heavy metal), club music (such as house and techno), and hip-hop.

In the 18th century, Romantic philosophers recommended intuition, emotion, and a connection to Nature as the necessary counterbalances to the intellectualism of the Age of Enlightenment. In the 20th century, Anglo–American preoccupations with authenticity centered on the writings of existentialist philosophers whose native tongue is not English; therefore, the faithful, true, and accurate translation of the term existentialism was much debated, to which end the philosopher Walter Kaufmann assembled a canon of existentialist philosophers. Kaufmann's canon includes the Dane Søren Kierkegaard (1813–1855), the German Martin Heidegger (1889–1976), and the Frenchman Jean-Paul Sartre (1905–1980). For these existentialists, the conscious Self comes to terms with existence (being and living) in an absurd, materialist world featuring external forces, e.g. Geworfenheit (Thrown-ness), and intellectual influences different from and other than the Self.

Beyond Good and Evil: Prelude to a Philosophy of the Future (German: Jenseits von Gut und Böse: Vorspiel einer Philosophie der Zukunft) is a book by philosopher Friedrich Nietzsche that covers ideas in his previous work Thus Spoke Zarathustra but with a more polemical approach. It was first published in 1886 under the publishing house C. G. Naumann of Leipzig at the author's own expense and first translated into English by Helen Zimmern, who was two years younger than Nietzsche and knew the author.

According to translator Walter Kaufman, the title refers to the need for moral philosophy to go beyond simplistic black and white moralizing, as contained in statements such as "X is good" or "X is evil". At the beginning of the book (§ 2), Nietzsche attacks the very idea of using strictly opposite terms such as "Good versus Evil".