The book is one of the best ever I read. True mind of God Patanjali ha been reflected here. Each and every Sutra has been explained in such a way that no one would be misguided to realize the meaning. The author Swami Hariharananda Aranya himself was a great yogin who spend his whole life in uter austerity and secluded himself in a cave for long 24 years for the cause of Samkhya & Yoga. Anybody will be surprised to find great differences in writing and explaining Sutras.