15 He wrote at all times in a dignified but facile style, varied now and then by a marvelous acuteness in thought and grace of expression, and by reason of these qualities his writings have proven themselves quite agreeable reading. After having pointed out how we must flee sin, fight against our evil inclinations, and avoid all useless and harmful actions, he then goes on expounding the nature of those practices of piety which cause the soul to grow, as well as how it is possible for man to remain ever united to God. Following this, he shows how necessary it is to select out a special virtue for constant practice on our part until we can say that we have mastered it. He writes, too, on the individual virtues, on modesty, on moral and immoral language, on licit and dangerous amusements, on fidelity to God, on the duties of husband and wife, of widows, and of young women.
Source: Rerum Omnium Perturbationem (Vatican.va)