Grimm criticized Rousseau's Julie, or the New Heloise and Emile, or On Education. Rousseau was induced by his resentment to give in his Confessions a malicious portrait of Grimm's character. Grimm's betrayals of his closest friend, Diderot, finally led Diderot to bitter denunciations of him too in his Lettre apologétique de l'abbé Raynal à M. Grimm in 1781.
