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The Lung is the chief of the Zang organs and the "Huagai" (canopy protecting the Heart) above the Heart. It stores the Po (Corporeal Soul) and governs Qi, directing the Qi of the entire body. The Classics state: "If one suffers loss or fails to obtain what is sought, it will cause Lung sounds (such as coughing or wheezing); when these sounds occur, it indicates Lung heat scorching the leaves." If nourished properly, one can withstand cold and heat; if injured, various pathogenic factors easily invade, and the body becomes flaccid and weak. Therefore, anger causes Qi to ascend, joy causes Qi to slacken, grief causes Qi to dissipate, fear causes Qi to descend, shock causes Qi to become chaotic, labor causes Qi to be consumed, and overthinking causes Qi to knot. The harm of the Seven Emotions (Joy, Anger, Worry, Overthinking, Grief, Fear, Shock) is all governed by Qi. Only by nurturing it uprightly without harm can one attain the "Haoran Zhi Qi" (Noble Spirit). At that point, human Qi can fill Heaven and Earth, and human Qi can unite with Heavenly and Earthly Qi, allowing human Qi to correspond with Dao Qi. The Former Kings closed the city gates on the Winter Solstice to nurture the subtle Yang Qi. Being cautious with speech and moderate with diet prevents the consumption of Qi.

The Kidney is the root of congenital constitution and the residence for storing Jing (Essence) and Zhi (Willpower). The Immortal Classics say: "May I ask what is the Xuanpin (Mysterious Female, referring to the source of life)? When the infant is first born, the two Kidneys form first." It also says: "The gate of the Xuanpin is the root of Heaven and Earth." Thus, before a person forms their body, the two Kidneys are generated first. Generally, before the fetus is complete, the Bao Tai (embryonic sac) knots together first; its image is hollow in the middle, with a single stem protruding upwards, resembling the stamen of a lotus. This single stem is the umbilical cord, and connecting to the stamen are the two Kidneys. They serve as the root of the Five Zang and Six Fu organs, the root of the Twelve Meridians, the master of respiration, and the source of the San Jiao (Triple Burner). Humans rely on them as the beginning of life; are they not the root of Heaven and Earth? And the Mingmen (Gate of Life) resides within them. Therefore, it is said: The Mingmen corresponds to 'Heaven generates One, Water,' hence it is called Kan Water. When human desires arise, they burn fiercely like fire. Water and Fire clash, leading to dry water and cold fire, extinguishing the flame of the Lingtai (Spiritual Platform/Heart-Mind). If Kidney Water dries up first, Wood has nothing to nourish, resulting in Liver disease. If Fire blazes, Earth becomes dry and the Spleen fails; when the Spleen fails, Metal lacks support, and symptoms of coughing manifest. This is referred to as the injury of the Five Elements, where the fundamental root is lost. How can one seek longevity under such circumstances! The Zhuangzi states: "What is most fearful in humans is the lack of caution between the bed sheets." The essence of health preservation lies primarily in reducing desires. Alas! Yuan Qi (Original Qi) is limited, while emotional desires are infinite. The Neijing states: "Using wine as liquid, treating reckless behavior as normal, engaging in intercourse while drunk, thereby exhausting one's Jing—these are things to be avoided." However, human desire is like termites in a tree; when termites are severe, the wood breaks; when desires are fierce, the body perishes. The Immortal Classics say: "Do not exhaust your form, do not shake your Jing, do not let your thoughts run rampant; thus you can achieve longevity." The wise should take this as a mirror.