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The *Classic of Internal Medicine* states: Water and fire are the manifestations of Yin and Yang. The Kidney corresponds to the Kan trigram, with one Yang line situated between two Yin lines; therefore, Yin must be balanced so that Yang can be stored securely. If intellectual activity opens up too early in childhood, leading to premature leakage of Yin essence, this is a major cause of disease. In adulthood, although Qi and Blood are vigorous, one may not yet feel the suffering. However, by age forty, Yin Qi naturally halves, daily living capacity declines, spirit becomes insufficient, and diseases occur in succession. Pulse diagnosis reveals the Chi (Cun-Kuan-Chi) position as deficient, fine, and choppy, while the Cun and Guan positions are larger than usual. Palpating the Chi position corresponds to the Kidney region; a fine and choppy pulse leaves no doubt about Kidney deficiency. The Cun and Guan positions being larger than usual is a sign of weak Yin and floating Yang.

In treating diseases, the difficulty for physicians lies not in the use of tonification, but in distinguishing between Water/Fire and Qi/Blood. Feng's book states: "Treat Qi and Blood for minor illnesses; treat Water and Fire for major illnesses." This is because Qi and Blood are the postnatal, tangible Yin and Yang, whereas Water and Fire are the prenatal, intangible Yin and Yang. The principle of Taiji dictates that the tangible arises from the intangible; thus, when treating major illnesses, should we not prioritize Water and Fire? Let us take insomnia as an example. People know it as a Heart disease, but do not realize it is also a Kidney disease. Although the Heart is the residence of the Spirit, communication between Kan (Kidney) and Li (Heart) is particularly precious. Bian Que stated that if Yang does not enter Yin, it causes insomnia; is this not due to the failure of Water and Fire to achieve Ji Ji (Completion/Interaction), and the loss of exchange between Kan and Li? The *Internal Classic* also mentions: "Headache and disorders of the vertex are caused by deficiency below and excess above, affecting the Foot Shaoyin (Kidney) and Foot Taiyang (Bladder) meridians." This description fits the pathogenesis of Jue (reversal) and dizziness most accurately. Medical texts often attribute these to Wind, Fire, or Phlegm, lacking fixed views. Zhang Jingyue inherited this idea, believing that "no dizziness occurs without deficiency," and treatment should address the lower body for upper symptoms, nourishing the root. Excellent, excellent. Temporarily take decoctions, and later formulate pills. The Way of Kings yields no immediate results; introspection and nurturing are essential.

Previous conditions of dizziness, palpitations, insomnia, and seminal emission originally belonged to dual deficiency of the Heart and Kidney, with Water and Fire failing to interact. Decoctions and pills were prescribed previously and taken for ten years. Now, the pulse is peaceful, and the spirit is vigorous; this is also the merit of nurturing, not solely dependent on herbal power. However, excessive food intake remains difficult to transform, the waist and back occasionally hurt, and seminal emissions still occur intermittently. Medicinal requirements remain indispensable. Examining ancient medication practices, there are two paths: attacking disease and preserving the body. Attacking disease involves using cold or hot properties, taking advantage of their bias; preserving the body requires adapting to cold and heat, using balanced properties. Excessive warmth may assist Ministerial Fire, causing the Essence gate to lose control; excessive moisture may damage Spleen Yang, impairing Kun Yuan (Spleen/Stomach) transformation, such as honey causing loose stools immediately, indicating Spleen deficiency unable to tolerate lubrication. Qing'e Wan can indeed treat Kidney deficiency lumbar pain, but Gu Zhi (Psoraleae Fructus) and Hu Tao Ren (Juglandis Semen) are acrid and warm; long-term use increases their Qi, potentially aiding Fire. Furthermore, long-term pill consumption must consider seasonal climates. In summer heat, avoid rigid/dry and approach soft/moist to prevent injury to Metal (Lung) and Water (Kidney). In winter cold, avoid soft/moist and approach rigid/dry to follow the intent of seeking warmth. As Summer Solstice approaches, one Yin begins to change, a time of insufficient Original Essence. It is proposed to benefit Yin and protect Metal, while regulating the Spleen and Stomach, to be reconsidered in autumn.