Here is the Hui-ming Ching, a classic Taoist manual on the circulation of internal energy by means of meditation and the inspiration for many techniques of Qigong. It is one of the few Taoist treatises to describe the landmarks of spiritual development and document the process of spiritual transformation from start to finish.

Eva Wong is an independent scholar, a translator of Chinese texts, and a practitioner of the Taoist arts of the Pre-Celestial Way and Complete Reality lineages. She has written and translated many books on Taoism and related topics, including A Master Course in Feng-Shui; Tales of the Taoist Immortals; Taoism: An Essential Guide; and Seven Taoist Masters.