Jean-Baptiste Chautard OCSO was a French Trappist abbot and religious writer. Dom Chautard was also responsible for foundations in Belgium (Orval) and Latin America, yet his reputation as the author of religious books made him even more well known among European and American Catholics. His Soul of the Apostolate[1] has been translated into several languages and is still in print. Chautard's books were the fruit of his daily spiritual conferences in the abbeys under his care; he was also an active letter writer. The book seeks to underline the basic and indispensable importance of prayer and Marian devotions, all the more so for people engaged in an active life of apostolic works.