Soul of The Apostolate, is a 444 page paperback book by Dom Jean-Baptiste Chautard. Favorite book of Pope St. Pius X. Says that prayer is the soul of every apostolic work; without it there is no success. Explores all the proved methods of developing and maintaining the interior life amid the bustle of daily activity. This excellent book will help you to understand the economy of salvation, as well as the many dead-ends that we fallen creatures tend to follow. A critically important introduction to the spiritual life!