Long and involved autobiography by the very influential French Enlightenment figure. Paul Johnson's evaluation of the man is on target in his book Intellectuals: How could anyone have ever taken him seriously? He certainly could write well, and had some original and unorthodox ideas, but they really don't ultimately make sense and the man himself was vain, paranoid and childish.
It's a testament to the gullibility of modern man that this man had the influence he did.