These are the Spiritual Exercises of St. Ignatius of Loyola, a plan of contemplation to be carried out over about a month. St. Ignatius of Loyola (1419-1556) was the founder of the Jesuits, and was canonized by Pope Gregory XV in 1622. He published the Spiritual Exercises in 1548. TheExercises were intended for use during a retreat; and are a central part of the first year training of Jesuit novitiates. However, one does not have to be a Jesuit-in-training to take advantage of theExercises: Increasingly, lay people and even non-Catholics follow this path.