"Thus Spoke Zarathustra: A Book for All and None" was a book by Friedrich Nietzsche. It is described in the preface of "Ecce Homo" with the phrase "among my writings my "Zarathustra" stands to my mind by itself", indicating its status as his magnum opus.
Zarathustra contains the idea of the "Superman" (Übermensch), the key concept of Nietzschean philosophy and objectives in the series.
As well as the character of Zarathustra, numerous episodes contain references to elements in the book, including the naming of Nietzscheans as "Ubers" in "Music of a Distant Drum".
- The book inspired a tone poem by Richard Strauss, the first section of which, named "Sunrise", is best known for its pivotal role in the opening of Stanley Kubrik's 1968 film "2001: A Space Odyssey".
- All of the "Xenosaga" games use the title of a Friedrich Nietzsche book.