St. lgnatius and his first companions wanted to serve the universal Church where its needs were the greatest. The result was the fourth vow of the professed members of the Society, whereby they pledged to obey the pope, as chief shepherd of the Church, regardless of the mission he chose to give them. Missioning, written in 1973 as part of Fr. Antonio M. de Aldama’s series of commentaries on the Constitutions, explores the notion of “sending” in the life of the Society of Jesus, and the role the fourth vow plays in the formation of the Society as a religious order. Chapters include guidance on the manner of travel (“the apostolic rule” is “not to travel on horseback, but on foot, without taking gold or silver”), a discussion of the criteria used in deciding where to send members, and the role of Jesuit houses and colleges as a “base camp” for apostles.