This volume brings together a wide selection of letters from Arthur Schopenhauer and some of his many correspondents, including his mother Johanna and his sister Adele, Goethe, and the publishers of Brockhaus. They are joined by friends, admirers, and disciples, as well as his only love, the chorister Caroline Medon. In total, nearly three hundred letters, many of them unpublished in Spanish, spanning Schopenhauer's childhood to his final days, and documenting a good part of his life and intellectual trajectory: from the awakening of his interest in philosophy to the development of his major work, from the years of hope and disappointment to those of greatest exaltation and recognition. A fundamental document not only for putting Schopenhauer's work into perspective, but also for approaching the biography of a thinker who devoted his life to knowledge and creation.