Updated September 13, 2014.
Yoga is 99% practice, 1% theory was a favorite saying of Ashtanga Guru Pattabhi Jois. Jois was saying that it's not that useful to sit around having philosophical discussions about how to become enlightened and the meaning of life. Instead, students should spent the majority of their time on doing the yoga asanas proscribed by the Ashtanga method. This quote is closely related to another famous Pattabhi Jois quotation, practice and all is coming.