“To the yogi, the path toward spirit lies entirely in the domain of nature. It is the exploration of nature from the world of appearances, or surface, into the subtlest heart of living matter. Spirituality is not some external goal that one must seek but a part of the divine core of each of us, which we must reveal. For the yogi, spirit is not separate from body. Spirituality is not ethereal and outside nature but accessible and palpable in our very own bodies.” —Yogācārya B.K.S. Iyengar, Light on Life, 2005, p. 18.