Two of Nietzsche's essential works explore the conflict between the moral and aesthetic approaches to life, the impact of Christianity on human values, the meaning of science, and the contrast between the Apollonian and Dionysian spirits. Although the Greeks, according to Nietzsche in The Birth of Tragedy, knew very well that life is terrible, inexplicable, and dangerous, they did not surrender to pessimism or rejection of life. Rather, they transmuted the world and human life in it through the medium of art. In doing so, they were able to say "yes" to the world as an aesthetic phenomenon in one of two modes: the Dionysian and the Apollonian. Translated by Francis Golffing.