Iyengar: By dedicated practice of the various aspects of yoga impurities are destroyed; the crown of wisdom radiates in glory.
Iyengar says that the wisdom achieved by practicing yoga keeps us “innocent and free of pride”. And this line strikes me in his commentary: “Perfection and success are certain only if one practices with ove and whole-hearted dedication.”
This sutra got me thinking about what motivates me to do yoga. I came to yoga to relieve physical and emotional suffering. I continue to practice for those same reasons. I just finished reading the book Drive by Daniel Pink (http://www.amazon.com/Drive-Surprising-Truth-About-Motivates/dp/1594488843/ref=sr_1_1?ie=UTF8&qid=1289687994&sr=8-1). In that book he outlines three thinks you need for instrinsic motivation:
Autonomy: People want to have control over their what they do.
Mastery: People want to get better at what they do.
Purpose: People want to be part of something that is bigger than they are.
I feel like I have that in my yoga practice. The freedom to practice when I want, what I want, and how long I want, the never-reaching-but-striving-towards mastery, and a higher purpose of connecting to myself and the larger world.
Bryant: Upon the destruction of impurities as a result of the practice of yoga, the lamp of knowledge arises. This culminates in discriminative discernment.
Bryant points out the the impurities here include the klesas – the five obstacles to yoga which are avidya/ignorance, asmita/ego, raga/attachment, dvesa/aversion, abhinivesa/clinging to life.
He also notes that this sutra seems to break from the first 27 sutras which discuss kriya yoga. He has a discussion on why this is not separated out in it’s own pada. Pantanjli does not note that the three components of kriya yoga (tapas, svadyaya, and ishvarai prandhana) which are niyamas are not connected here.
Taimni: From the practice of the component exercises of yoga on the discustion of impurity, arises a spiritual illumination which develops into awareness of Reality.
Taimni comments that this sutra says that the guidance for yoga comes from spiritual illumination within oneself and says it is similar to intuition. It is independent of external guidance.
He says that students who start yoga out of curiousity often drop out because they cannot bear “its ceaseless strain and the ruthless stripping of the personality which is involved”. And later, he says if a student comes to secure “release from the limitations and illusions of human life and its miseries” are the people qualitifed “to tread this path”.
Carrera: By the practice of the limbs of Yoga, the impurities dwindle away and there dawns the light of wisdom leading to discriminative discernment.
He says that yoga doesn’t really bring anything new but removes the unwanted and once that unwanted (the impurities) is removed, the wisdom within is revealed.