This book presents a new translation of the Spiritual Exercises of Ignatius de Loyola, of his Spiritual Diary, of his Autobiography, and some of his letters. These translations are introduced by a hermeneutical commentary laying out the theory and practices of the decision-making power of imagining. Ignatius proposed in his Spiritual Exercises a form of decision-oriented mysticism, and through their use, gathered around him a group of associates who became the firs members of the Jesuit Order. Under the control of later, doctrinally oriented theologians, the practical, decision-oriented mystical character of the original Exercises was gradually replaced by a more theoretical and devotional character. Antonio T. de Nicolas recovers in his translations and through his critical apparatus, the original decision-oriented thrust of Ignatius.