One of the most-loved and revered teachers of Yoga, B K S Iyengar has many titles on the art of Yoga to his credit. Though his other book, Light On The Yoga Sutras Of Patanjali, has also dealt with Yoga in great detail, Core Of The Yoga Sutra: The Definitive Guide To The Philosophy Of Yoga is more about the core philosophy in Yoga, which comes from the Yoga Sutras of Patanjali itself.
 
The Yoga Sutras of Patanjali are a set of 196 adages and principles on which the art is based. These aphorisms constitute the foundational text of yoga. Each aphorism mentioned has also been explained in detail, having been translated clearly for the modern reader. Iyengar has also interlinked each sutra.