This book primarily focuses on providing authoritative knowledge about the practitioner, the jīva. Knowledge about the jīva is gained from śāstra. However, if one does not know how to interpret it properly, śāstra can be misunderstood. It is for this reason that there are differences of opinion about the nature of the jīva in different groups of spiritualists. In this book, some basic principles are discussed that govern how śāstra is meant to be understood at different levels and how its true intentions are realized.