In his homilies and addresses, in his audiences and meditations, and in his interviews and his apostolic exhortations, Pope Francis addresses with regularity the topic of the devil and his works. As a Jesuit, his thought is heavily influenced by St Ignatius of Loyola, founder of the Society of Jesus and author of the Spiritual Exercises. St Ignatius taught extensively about the battle between good and evil, about how we must choose between the “two standards” of following Christ or following the ways of the devil, as well as about our need for sound discernment of spirits. Pope Francis offers practical pastoral guidance—culled from the wisdom of the Church—for resisting temptations and doing spiritual battle with the “evil one”, the “ruler of the world” (Jn 14:30). This book draws upon these various sources and presents, in his own words, a survey of Pope Francis’ teachings on the devil.