Patanjali was the author of the original “Yoga Sutras” over 2 thousand years ago. Patanjali defines Yoga as “stilling the movements in the mind”, which leads to one’s true self. He explains the path of Yoga as well as the obstacles. Mr. Iyengar has taught all of his teachers to chant the Invocation to Patanjali at the beginning of class, to put the yogi in the right state of humility, reverence and openness.