The Spiritual Exercises of Ignatius of Loyola, composed 1522–1524, are a set of Christian meditations, contemplations, and prayers written by Ignatius of Loyola, a 16th-century Spanish priest, theologian, and founder of the Society of Jesus (Jesuits). Divided into four thematic "weeks" of variable length, they are designed to be carried out over a period of 28 to 30 days. They were composed with the intention of helping participants in religious retreats to discern the will of God in their lives, leading to a personal commitment to follow Jesus whatever the cost. Their underlying theology has been found agreeable to other Christian denominations who make use of them[3] and also for addressing problems facing society in the 21st century.