The Great Harmonia The Thinker: Being A Progressive Revelation Of The Eternal Principles V5 is a book written by Andrew Jackson Davis. It is a comprehensive study of the principles of spirituality and metaphysics. The book is divided into several chapters, each of which provides an in-depth analysis of a specific topic. The author explores the nature of the human mind, the principles of the universe, and the laws of creation. He also discusses the...