Austrian psychologist Wilhelm Stekel (1868–1940) referred to Kierkegaard as the "fanatical follower of Don Juan, himself the philosopher of Don Juanism" in his book "Disguises of Love". German psychiatrist and philosopher Karl Jaspers (1883–1969) stated he had been reading Kierkegaard since 1914 and compared Kierkegaard's writings with Friedrich Hegel's "Phenomenology of Mind" and the writings of Friedrich Nietzsche. Jaspers saw Kierkegaard as a champion of Christianity and Nietzsche as a champion for atheism. Later, in 1935, Karl Jaspers emphasized Kierkegaard's (and Nietzsche's) continuing importance for modern philosophy