In Letters from Xenocrates to Pheres (1724) Montesquieu explores the politics of Regency France ( 1715-1723) during the minority of Louis XV. In On Politics (1725) he implores princes to employ straightforward and moral strategies rather than resorting to the ruthless tactics recommended by Machiavelli in The Prince. In Reflections on Universal Monarchy in Europe (1732–1733) he stresses the need to inject morality into international relations and teaches that warfare no longer bestows the same benefits as in Roman times. In his Reflections on the Character of Certain Princes and Certain Events in Their Lives (1731–1733) Montesquieu emphasizes the need for moral values in politics and shows that immoral acts by princes result in harm, not benefit. In his Memorandum on the Silence to Impose on the “Constitution” (1754), he offers Louis XV advice on how to deal with the presence of the Jansenist, predestinarian strain of Catholicism in France. He concludes that toleration is a practical necessity and says priests should be forbidden to inquire of parishioners whether they are Jansenists, who in turn should not identify themselves as such.