S ren Kierkegaard (1813-1855) was one of the most passionate and imaginative of all philosophers. In pursuit of the question of existence, he broke off his engagement to Regine Olsen. Over the following decade a series of the most profound and transformative works in modern philosophy poured from him, including Fear and Trembling, The Sickness Unto Death and Either/Or, from which The Seducer's Diary is taken.