Book excerpt: In this finely written study of demonology and Christian spirituality in fourth- and fifth-century Egypt, David Brakke examines how the conception of the monk as a holy and virtuous being was shaped by the combative encounter with demons. Drawing on biographies of exceptional monks, collections of monastic sayings and stories, letters from ascetic teachers to their disciples, sermons, and community rules, Brakke crafts a compelling picture of the embattled religious celibate.