"Introduction to the Devout Life" is a spiritual guide written by Saint Francis de Sales in the early 17th century. It aims to help ordinary people live a devout and fulfilling Christian life, emphasizing the importance of personal holiness in everyday activities. The book is structured into five parts, covering topics such as prayer, the sacraments, and the virtues necessary for a devout life. Saint Francis de Sales encourages readers to cultivate a deep relationship with God while engaging with the world, making it accessible for both clergy and laypeople seeking spiritual growth.