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How did St. Francis de Sales influence Roman Catholic devotional life?

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Title page of a 1568 Welsh Christian doctrine book by Morys Clynnog, featuring Welsh text and a woodcut illustration of the crucifixion of Jesus at the center. — Counter-Reformation Title page of *Athravaeth Gristnogavl* (1568; “Christian Doctrine”), a Roman Catholic catechism translated into Welsh by Morys Clynnog as part of the church's Counter-Reformation efforts.

St. Francis de Sales significantly influenced Roman Catholic devotional life during the Counter-Reformation by democratizing the pursuit of spiritual perfection.

His most notable contribution was the devotional classic Introduction to a Devout Life. At a time when many believed that achieving spiritual holiness required withdrawing from society into monastic life, Francis argued that spiritual perfection was attainable for individuals actively engaged in the affairs of the world.12

By emphasizing that devotion could be integrated into daily life, he provided a practical framework for laypeople to deepen their faith. His influence was further solidified by his role as a Doctor of the Church, a title recognizing the enduring importance of his writings, which include sermons, letters, and works addressing both spiritual growth and theological controversies against Calvinism. Additionally, his cofounding of the Visitation nuns helped expand the reach of Catholic teaching and religious practice during this era.12