Zarathustra, then,—this shadowy, allegorical personality, speaking in allegories and parables, and at times not even refraining from relating his own dreams—is a figure we can understand but very imperfectly if we have no knowledge of his creator and counterpart, Friedrich Nietzsche; and it were therefore well, previous to our study of the more abstruse parts of this book, if we were to turn to some authoritative book on Nietzsche's life and works and to read all that is there said on the subject.