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This is Zhang Zihe distinguishing dampness and fire by viscera, comparing it to fat people generating phlegm from cold-dampness and thin people generating dryness from intense heat, which is particularly exquisite when described in terms of body constitution.

The Liver and Gallbladder have always been treated according to the principles of Fire; the Sanjiao (Triple Burner) and Pericardium are no different.
Fire possesses Yin within and Yang outside, primarily manifesting as "movement." All movement is the function of Ministerial Fire (Xiang Huo). Without this fire in Heaven, living things could not be generated; without this fire in humans, life could not be sustained. The fire of Heaven, emerging from Dragon and Thunder Qi, manifests as the Qi of Wood; emerging from the Sea, it manifests as the Qi of Water. However, Thunder cannot roar unless it lies dormant, Dragons cannot fly unless they hibernate, and the Sea cannot create waves unless it adheres to the earth. Roaring, flying, and waving are all transformations into Fire due to "movement."
Human Fire resides in the Liver and Kidney. The Liver belongs to Wood, the Kidney to Water. The Bladder is the Fu organ of the Kidney; the Pericardium is the counterpart of the Kidney; the Sanjiao is named for its scorching nature, and the Lower Jiao governs the domains of the Liver and Kidney. All these belong to Yin and are located inferiorly, thus they are all treated according to the principles of Fire. Yet, although human Fire shares the same origin as Heavenly Fire, it is considered a thief of Original Qi (Yuan Qi) because humans are constantly active in desire, causing Ministerial Fire to fan the flames, boiling away True Yin. Yin deficiency leads to disease, and Yin exhaustion leads to death. This was clearly stated by Dairen (Zhang Zihe) and Dongyuan (Li Gao), not just Zhang Zihe alone.

The Lung and Stomach are often sought where Dampness exists; the Lung and Large Intestine belong to the category of Dampness.
The Intestines and Stomach belong to Dampness, referred to as the Sea of Water and Grain, the place where Dampness stagnates and Water gathers, characterized by being "full but not solid" (referring to content rather than structure). When the Spleen moves and the Stomach transforms, transporting clear Qi upward, this meridian first receives Dampness. The Lung belongs to Metal, possessing a pure and high nature; how can it be classified under Dampness? Because when Clear Qi rises, it becomes Clouds in Heaven and Qi in humans; when Turbid Qi descends, it becomes Rain in Heaven and Dampness in humans.

The Kidney and Bladder, Heart and Small Intestine: Cold and Heat patterns require temporary deliberation.
Heart labor damages Blood; Kidney labor damages Essence. Once Essence and Blood are damaged, Water and Fire become unbalanced, leading to dual deficiency of Yin and Yang, with alternating cold and heat symptoms. If involving the Gallbladder and Bladder, which are also "full but not solid," exiting but not entering, the chills and fever from Cold Damage (Shang Han) all emanate from these meridians. Saying their treatment has no fixed method is because cold and heat intermingle, requiring varied therapeutic approaches.

Chills with exterior heat relate to Dampness in the Small Bladder; aversion to heat with exterior cold indicates blazing Fire in the Heart and Kidney. Among the Twelve Meridians, the most definitive are: four meridians belong to Fire, four to Dampness, and four have variable Heat and Cold. Attacking the interior and releasing the exterior must be carefully considered; interior Heat or Cold should be treated with purging or emesis, while exterior Heat or Cold should be resolved through sweating. Dampness is akin to Cold, Fire is akin to Heat; at the extreme, there are no two ways to interpret it. Dividing the Six Qi, Fire/Heat and Cold each have their place; wavering between Cold and Heat is truly futile speech. When Heat and Cold repel each other, the pathogenesis is profound: "Excess causes harm, control brings regulation."

When Qi arrives, if it reaches the extreme, it becomes a disaster; when Qi attacks, it must be balanced through counter-action (retribution/control). Things turn back when they reach the extreme; this is the natural law. Taking Heart Fire as an example: if it is not hyperactive, although Kidney Water is feared by Heart Fire, it merely guards against it; once Heart Fire becomes hyperactive, Kidney Water rises to overcome it. The same applies to other Zang organs. Using human affairs as a metaphor: if I contend with another in excess, they will surely harm me; if I can withstand and control them, they will instead be subdued by me. This is merely an analogy. The discussion on the winning and restoring of Qi movements is detailed in *Su Wen: Chapter 64 - The Theory of the Six Micro-Principles*.

A tight pulse indicates Cold, a rapid pulse indicates Heat; treating both root and branch is a true subtle secret. Do not treat Wind directly, do not treat Dryness directly; when Fire is treated, Wind and Dryness are resolved. When it is time to release the exterior, do not attack the interior; when it is time to attack the interior, do not release the exterior. If both exterior and interior can be attacked, distinguish the priority and proportion based on internal and external factors.

Treating Dampness is nothing short like diverting a river.

Fire is often in excess, Water is often deficient. However, when Fire is in excess, it is Evil Fire. If it were True Fire protecting the body and irrigating the viscera, having it means life, losing it means death, and weakening it means illness. This is True Yang; how can it be in excess? When Water is deficient, it is True Water. If Evil Water overflows the collaterals, causing swelling, pain, numbness, phlegm, dysentery, sores, and toxins, one should use methods to drain and disperse from the lower part, much like diverting a river. In cases of essence depletion and blood exhaustion, tidal fever, and weakness, this is True Water deficiency with solitary blazing of Heart Fire; one should nourish Yin and tonify the Kidney, strictly avoiding diuretic/draining methods. This is the balanced approach to treating Water.

This metaphor (the trap and net) is very clear; grateful for the grace of Xuanyuan (Yellow Emperor) for ten thousand generations, those petty men fighting for vinegar laugh at the smallness of heaven.