This book investigates the historical and philosophical origins and development of Gnosticism. Martin Seymour-Smith, an established scholar of religion and philosophy, draws upon a range of primary and secondary sources to present a comprehensive overview of this complex and often misunderstood spiritual movement. The work aims to elucidate the core tenets, diverse schools, and lasting influence of Gnostic thought throughout history.

This work is recognized as a thorough and scholarly examination of Gnosticism, offering a detailed exploration of its historical roots and philosophical underpinnings. Scholars and students of religion and philosophy have found it to be a valuable resource for understanding the complexities of Gnostic thought. The book is noted for its comprehensive scope and its ability to synthesize a wide array of information on the subject.