As long as you do not feel the serenity in the body, in each and every joint, there is no chance for emancipation. You are in bondage. So while you are sweating and aching, let your heart be light and let it fill your body with gladness. You are not only becoming free, but you are also being free. What is not to be glad about? The pain is temporary. The freedom is permanent.
Light on Life: The Yoga Journey to Wholeness, Inner Peace, and Ultimate Freedom (ed. Rodale, 2006) - ISBN: 9781609619589