In his correspondence with women—who he always loved with embarrassment and difficulty—Friedrich Nietzsche (1844-1900) reveals himself in a special way. His fragile and shy temperament contrasts with the image he claims to be “dynamite”. Behind the affectionate lyrics, declaimed with despair or whispered, we discover a clumsy lover, too much human. And in his last letters to Cosima Wagner, already hovers the fascinating and terrible shadow of madness.