""The Mystery Language And Its Keys"" is a book written by Helena Petrovna Blavatsky, a prominent figure in the Theosophical Society. The book explores the concept of a universal language that is said to have been used by ancient civilizations, such as the Egyptians and the Atlanteans. Blavatsky delves into the symbolism and meaning behind various words, phrases, and symbols, providing insights into the esoteric teachings of these ancient cultures...