In 1880 Nietzsche observed that Goethe had been "not just a good and great man, but an entire culture." The author of Faust, of exquisite lyric poetry, and of a bewildering variety of other plays, novels, and poetry as well as treatises on botany and color theory, Goethe also excelled as an administrator in the cabinet of Carl August, Duke of Saxe-Weimar. Now, Nicholas Boyle has written the definitive biography of this extraordinary figure--indeed,...