Evagrius Ponticus was the most prolific writer of the Christian Desert Fathers. This book is a study of his life, works, and theology. It gives particular attention to his little-studied exegetical treatises, especially the Scholia on Psalms, as well as his better-known works, in order to present a more balanced picture of Evagrius the monk. The practice of psalmody in Northern Egyptian monastic communities of the late fourth century is explored, as is Evagrius' understanding of psalmody's healing properties, and his recommendation of memorized scripture as a spiritual weapon against temptation. Further chapters discuss Evagrius' model of spiritual progress and his use of medical terminology and theory; the logoi of providence and judgement and their use in Christian contemplation; and Evagrius' controversial Christology and his work, the Kephalaia Gnostica.