George Prochnik at the TLS:
The first time Sigmund Freud wrote of destroying his papers he was twenty-one years old. He was writing to Eduard Silberstein, an intimate friend of his youth and the sole other member of the Academia Castellana, a make-believe Spanish literary society anchored in Cervantes trivia, which served them as a secret forum for airing playful fantasies and precocious world-weariness. Freud invited Silberstein to help expunge the record of their relations by conjuring up a pleasant winter evening in which they could come together to burn their archives “in a solemn auto-da-fé”. The next occasion was eight years later, in a letter to his then fiancée Martha Bernays, during what he described as a “bad, barren month”, waiting for money from a chemist to finance further research into cocaine, doing almost nothing except browsing through Russian history and toying with two rabbits who continually nibbled turnips and messed up his floor. His only real accomplishment, he told Martha then, was to have nearly completed his intention of doing something that would dismay various unborn, unfortunate people – namely his future biographers. He’d destroyed all his notes from the past fourteen years, along with correspondence and the original manuscripts of his scientific papers. In 1907, he once again burned a huge trove of private documents. Finally, in 1938, just before escaping Nazified Vienna, he delegated to his daughter Anna the task of overseeing another bonfire of his letters, which she undertook together with his disciple Marie Bonaparte.
more here.