Must read to know about Indian spiritual center point and what is said in the ancient tamil literature on spiritual thinking (here i mention it spiritual i don't know the one specific equivalent english word of what is said in this book). This is very intense book at the outset, once the reader gets into the line of what is said in book the reader will get insights about what is said. The book will set the reader to think and read about various dimensions of what is said as athma, yogam, gyanam, dhyanam, adhvitham, many many more. This book is unique to tamil reader, need to read this book with open mind if any affiliation to any particular already conditioned mind this book will not give any new dimensions.
Extensive citations on various authors makes one to read more on understanding on Indian line of quest on understanding athma, and Bhramam. This book will be a start to read more there are lot of reference to other books.