“Let me re-state what I most hope to pass on to you, i.e., the importance of the words of Lao-tzu in the opening lines of the Daode Jing. I.e.., the Dao has two related aspects: “You有” and “Wu无.” The Dao of “You” change, which is written in the oracle bones as a hand holding onto a piece of edible meat, is called by later Daoists the Dao of the “Posterior” or “visible” heavens; it is represented by the Eight Trigrams which cause change in the “Posterior Heavens” (Hou-tian zhi Dao, 後天之道 ). It is the “later” or visible, i.e., named, able-to-be-conceptualized and put-into-words Dao. This is the Dao of You-wei 有为 (n.b., author’s note: Daoist “kataphasis;” pronounce “Yoe-wei!”). It is continually working in the farthest reaches of the cosmos.
The apophatic, transcendent, or non-changing aspect of the Dao, is called “Wu-wei 无为 (apophasis).” It is to be found interiorly. It is rooted in the belly, the “lower cultivation field.” Zhuangzi (Chuang-tzu) taught us that only when we practice “heart fasting” and “sitting in forgetfulness,” can we focus on Dao as Wu-wei presence, without word, motion, or action, in fact, transcending knowledge. This is called “The Dao of the Prior Heavens,” (Xian tian zhi Dao 先天之道), which means in practice, awareness of Dao as present, from the lower cultivation field (xia dan tian 下丹天), the womb of meditation, the source of inner cultivation. When we say, “keep the One,” (shou-yi守一) we mean to always “return to” Wu-wei Dao present in the belly, by stopping all of the mind’s judgments, and the heart’s desires.
Qingwei Thunder and lightning registers are used to purify heart and mind, so we can always remain aware of Dao presence in our belly, the center of the microcosm.”清微五雷法用為心齋坐忘能於道合一。