Abbot Nault says that acedia is the most oppressive of demons. Although its name harkens back to antiquity and the Middle Ages, and seems to have been largely forgotten, acedia is experienced by countless modern people who describe their condition as depression, melancholy, burn-out, or even mid-life crisis. He begins his study of acedia by tracing the wisdom of the Church on the subject from the Desert Fathers to Saint Thomas Aquinas. He shows how acedia afflicts persons in all states of life— priests, religious, and married or single laymen. He details not only the symptoms and effects of acedia, but also remedies for it.