A wonderful, wonderful book. Terrificly unpacks Scupoli's already terrific The Spiritual Combat by going into the sources that informed and inspired it (especially John Cassian, but also Augustine and Aquinas) and also the writings of great saints who were influenced by it (St. Francis de Sales and Blessed John Henry Newman). However, the author does not do this in a dry academic way, but in a way that is practical and applicable to the pursuit of holiness. Read Scupoli's Spiritual Combat (preferrably the TAN press edition), then read this book.