This is an excerpt from Lü Dongbin's The Secret of the Golden Flower, specifically Chapter 7, "The Living Practice of Returning the Light." It details a meditative practice called returning the light (huiguang), emphasizing consistent mindfulness in daily life. The practice involves cultivating a detached awareness without clinging to self or external things, achieved through reflective observation. The text suggests consistent practice, even for short periods, will eventually lead to spiritual progress.