Already, in such brilliant treatises as the Lankavatara Sutra, the answer was a resounding “Yes!” The Lankavatara Sutra was so important that it was passed down to their successors by all five of the first Ch’an (or Zen) Head Masters in China as containing the essence of the Buddha’s teachings. In fact, the early Ch’an school was often referred to as the Lankavatara school, and a history of this early period is entitled Records of the Lankavatara Masters. (Starting with the sixth Head Master, Hui Neng, the Diamond Sutra—a treatise solely devoted to pure Emptiness—displaced the Lankavatara Sutra, and in many ways Zen lost the philosophical and psychological sophistication of the Lankavatara Sutra system and focused almost exclusively on nonconceptual awareness. Zen masters were often depicted tearing up sutras, which really amounted to a rejection of the Two Truths doctrine. This was unfortunate, in my opinion, because in doing so, Zen became less than a complete system, refusing to elaborate conventional maps and models. Zen became weak in relative truths, although it brilliantly succeeded in elaborating and practicing ultimate Truth. I say this as a dedicated practitioner of Zen for fifteen years, before I switched to a more Integral Spirituality, which included, among others, Vajrayana, Vedanta, and Christian contemplative approaches. We’ll see what all this means as we proceed. And, as we’ll also see, one can belong to any traditional religion, or no religion at all, and still adopt an Integral Spirituality, which is really an Integral Life Practice, incorporating what humanity has learned, East and West—and in premodern, modern, and postmodern times—about psychological growth, development, and evolution.)