The science of meditation, as a technique for training the mind, is being practiced more and more throughout the world. Meditation is associated with a flow of energy that is impersonal and fiery in nature; Therefore, the potential dangers in occult meditation should be understood and avoided, and safe and reliable methods should be used. This book sets forth the main factors, general and specific, showing the purpose of occult meditation, as well as the means of achieving it. The book contains letters from the Tibetan teacher received between May 16, 1920 and October 20, 1920, except for two letters received in 1919. The first edition was in 1922.