Fantastic book for practicing concentration. This is a very challenging book but it would be highly worth it for those who can follow through with his intense requisites.
Concentration is one of the most important skills to cultivate throughout ones life and this book gives on a. primer on how to cultivate it so one can go on to work on more serious attainments. this is the foundation for getting those other attainments, as if you cannot concentrate, how can you attain Samadhi or any Dhyanas?
10/10