Physically handicapped by weak eyesight, violent headaches and bouts of nausea, this paradoxical thinker fashioned a philosophy, which made short shrift of self-pity and the ostentatious display of compassion. The son of a Lutheran clergyman, whom he adored, he became a fearless agnostic who proclaimed, in Thus Spake Zarathustra that "God is dead " Of modest bourgeois origins, he detested middle-class conformity, and turned to an uncompromising cult...