""An Introduction to the Apostolic Gnosis"" is a book written by Thomas Simcox Lea that explores the early Christian movement known as Gnosticism. The book delves into the beliefs, practices, and teachings of the Gnostics, who believed in a secret knowledge of the divine that was only accessible to a select few. Lea provides an overview of the historical context in which Gnosticism emerged and discusses the various Gnostic texts and traditions that...