The Gnostic Trilogy is the best-known and most important work by the ascetic philosopher and teacher Evagrius of Pontus. Among the writers of his age, Evagrius stands out for his short, perplexing, and absorbing aphorisms, which provide sharp insight into philosophy, Scripture, human nature, and the natural world. The first part of the trilogy, the Praktikos (The Practiced One), provides a diagnosis and treatment of the eight tempting thoughts...