""The Visible and Invisible Worlds"" by Max Heindel is a spiritual book that explores the nature of the universe and the hidden dimensions that exist beyond our physical world. Heindel's writing draws from a variety of esoteric traditions, including Rosicrucianism, Theosophy, and Hermeticism, to provide a comprehensive understanding of the spiritual realms. The book is divided into two parts, with the first part focusing on the visible world and the...