Thus Spake Zarathustra is an important philosophical text by German philosopher Friedrich Nietzsche. In it he begins his exploration of morality, questioning the assumption of Christianity or Judaism as a basis for morality. He wrote about the "death of God" and the "Ubermensch" (superhuman) who would have supreme morality.Ironically, Nietzsche mimics the style of the Bible, fictionalizing Zarathustra as his protagonist.

Friedrich Nietzsche:Friedrich Wilhelm Nietzsche was a German philosopher of the late 19th century who challenged the foundations of Christianity and traditional morality. He was interested in the enhancement of individual and cultural health, and believed in life, creativity, power, and the realities of the world we live in, rather than those situated in a world beyond. Central to his philosophy is the idea of "life-affirmation," which involves an honest questioning of all doctrines that drain life's expansive energies, however socially prevalent those views might be. Often referred to as one of the first existentialist philosophers along with Søren Kierkegaard (1813-1855), Nietzsche's revitalizing philosophy has inspired leading figures in all walks of cultural life, including dancers, poets, novelists, painters, psychologists, philosophers, sociologists and social revolutionaries.