The Spirit of the Zoroastrian Religion is a book written by Henry S. Olcott, an American author and founder of the Theosophical Society. The book explores the ancient religion of Zoroastrianism, which originated in ancient Persia and is considered one of the oldest monotheistic religions in the world.Olcott delves into the history and teachings of Zoroastrianism, including its beliefs in a single god, the struggle between good and evil, and the importance...