Nietzsche's Diwan by Friedrich Nietzsche... Rarely has a thinker or philosopher in the West or the East left the impact that the German thinker and poet Friedrich Nietzsche left, whether in his time or in later times. Nietzsche was able, especially in his famous book «Thus Spoke Zarathustra», to cause a real earthquake in the prevailing concepts and values ​​that are still being repeated.