"This is certainly one of the most profound and original contributions to the understanding of classical yoga."
Mircea Eliade
"An all too rare combination of sound scholarship, common sense and personal experience. Feuerstein's views, born of a long acquaintance with the original texts and tested against a large critical reading, are both fresh and mature, and he at last emerges from the role of skillful adaptor to be given his rightful place among the great masters of philosophy."
Dr. Daniel Mariau
"Provides us with a highly original overall picture of classical yoga...The other great merit of this work is that it never loses sight of the psycho-integrative and experiential matrix of a great many key concepts of classical yoga."
Prof. Corrado Pensa