David Schroeder contends that Mozart's father, Leopold, intended to write a biography of his son and designed his correspondence to be published as a type of moral biography. He bombarded his son with letters that often began with amusing anecdotes and then offered a torrent of advice on every imaginable subject. Dealing with these often biting letters presented Mozart with a challenge. He could react with anger, but that type of revolt only fired Leopold's criticism, and it proved much more effective to be evasive or dissimulating. Mozart's letters, in contrast to the moral German-styled letters he received, came closer to the more wily French letters of the philosophes, Voltaire especially, whose style he would have discovered while living in Paris. Eventually Mozart turned the correspondence into an epistolary game, willfully making his letters unprintable and deliberately subverting his father's plans.