Oliver Dy’s contribution is a technical discussion of the Rules for Discernment of Spirits in the Spiritual Exercises of St. Ignatius. These so-called Rules are intended to help those attentive to their spiritual life as they contend with many and often opposing thoughts and feelings. Dy’s essay begins with the work of Ignatian scholar Michael Buckley on the structure and dynamics of the Rules and expounds on their nature and application at different points in one’s spiritual journey. – from the Editor’s Preface