On his return to Paris he was called upon to defend against de Rance, the abbot of La Trappe, the legitimacy for monks of the kind of studies to which the Maurists devoted themselves: this called forth Mabillon's Traite des etudes 7nonastiques and his Reflexions sur la reponse de M.
Long before his flight from France Quesnel had published a devotional commentary - Reflexions morales sur le Nouveau Testament - which had gone through many editions without exciting official suspicion.
The pope's choice of a book to condemn fell on Quesnel's Reflexions; in 1713 appeared the bull Unigenitus, anathematizing no less than one-hundredand-one of its propositions.
He is even more discursive and more homiletical in style; he adds fresh citations of the Scriptures, and additional explanations and moral reflexions; and all this with so little judgment that he often leaves confusion worse confounded (e.g.
1844), made up chiefly of contributions to the Debuts, his Notices sur t'Allemagne (1834), and many volumes of collected Souvenirs, Reflexions, &c., on foreign countries and passing events.