While sitting, one must therefore always keep the heart quiet and the energy concentrated. How can the heart be made quiet? By the breath. Only the heart must be conscious of the flowing in and out of the breath; it must not be heard with the ears. If it is not heard, then the breathing is light; if light, it is pure. If it can be heard, then the breath-energy is rough; if rough, then it is troubled; if it is troubled, then indolence and lethargy develop and one wants to sleep. That is self-evident.
Translators of The Secret of the Golden Flower are Richard Wilhelm and Cary F. Baynes. If you missed any posts in this series, please utilize the Golden Flower label below.