The Yoga Sutras were composed nearly 2,000 years ago and have become one of the classic yogic texts. You may have seen it on the bookshelf at your local studio, on the reading list for teacher trainings, or heard it alluded to in class. But it can often remain shrouded in a certain mystery. So, what’s it all about? Are Patanjali’s sutras still relevant to modern yoga? And can following its principles make a difference?