Thus spoke Zarathustra. A book for everyone and no one (Also sprach Zarathustra. Ein Buch für Alle und Keinen) 1883 and 1885. The author's main ideas, expressed poetically. As a literary device, Nietzsche uses an imaginary version of Zarathustra, which does not represent the historical figure but serves as a spokesperson and symbol of the main ideas on which all his work is based and which are exhaustively treated throughout this book: the death of God, the Übermensch, the will to power and (defined for the first time, although not explicitly developed) the eternal return of life.

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He presents himself as the supreme prophet, superior in wisdom and knowledge to the rest of humans. Nietzsche uses it as a contrast to the doctrine of the Catholic Church, which he considers the heir of Socrates in terms of the way of understanding life. Zarathustra was chosen by the author as an example of pre-Socratic philosophy, to explain his theory of the Übermensch, vitalist and naturalist, and to vindicate the acceptance of the negative and positive aspects of life. In short, to propose an attitude of acceptance of life in its fullness and denial of the afterlife, which in his opinion was the cause of human weakness.