The book is an introduction to the methods of attaining God-realization and to the spiritual wisdom of the East. The writing of the book was prophesied long ago by the nineteenth-century master Lahiri Mahasaya (Paramguru of Yogananda) also known as the Yogiraj and Kashi baba. Before becoming a yogi, Lahiri Mahasaya's actual name was Shyama Charan Lahiri.
