Volume VI of Correspondence of Friedrich Nietzsche, the last of the series, covers all written by the philosopher in late October 1887 and January 1889 extant letters when collapse suffered in Turin that plunged him into dementia and that he never recovered until his death in August 1900 These letters of his mature, written with unmistakable style and masterful prose, have at least a dual philosophical and biographical interest. In them the emergence and problems that feature both the works written in these final two years' The case Wagner, Twilight of the Idols, The Antichrist, Ecce Homo, Nietzsche and Dionysus Dithyrambs against Wagner discussed widely discussed in these letters, as large projects that underpin the posthumous fragments scored then later discarded-the "will to Power", later transformed into "Revaluation of all values" -.

But in these letters are also found intimate correspondence with his friends and family-the always faithful colleague Franz Overbeck University of Basel; Heinrich Köselitz musician, whom Nietzsche called Peter Gast and it helped in the preparation of texts almost as his secretary; the great historian Jacob Burckhardt; maternal Wagner von Meysenbug Malwida friend; sister and mother and sharp dialogue that Nietzsche had with a large group of writers, thinkers and artists, some of which was related particularly in those months as intense as production and rapid change: for example, Danish intellectual Georg Brandes, the Swedish playwright August Strindberg, the French historian Hippolyte Taine, the musician Hans von Bülow, his former colleague or studies, the great Orientalist Paul Deussen.