It is also found in Nietzsche 's classic work `` Thus Spoke Zarathustra '' ( German : `` Also sprach Zarathustra '' ) , which is most responsible for popularizing the phrase .
It is also found in Nietzsche 's classic work `` Thus Spoke Zarathustra '' ( Deutsch : `` Also sprach Zarathustra '' ) , which is most responsible for popularizing the phrase .