Nietzsche’s principal works consist of 10 books, which are universally held to be a major achievement. His most famous works include The Birth of Tragedy (1872), The Gay Science (1882), Thus Spoke Zarathustra (released in four parts from 1883 to 1885), Beyond Good and Evil (1886), On the Genealogy of Morals (1887), and The Anti-Christ (1888). Not to be forgotten is Ecce Homo, or Behold the Man (1888), which he dedicated to Voltaire and in which Nietzsche included his own endearing essay about his own works, “Why I Write Such Good Books” (1888).