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The Mingmen (Gate of Life) is the sea of essence and blood, and the Spleen and Stomach are the sea of water and grain; both serve as the root of the five zang organs and six fu organs. However, the Mingmen is the root of Yuan Qi (Primordial Qi), and the residence of Water and Fire (Kidney Yin and Kidney Yang). The Yin Qi of the five zang organs cannot nourish without it, and the Yang Qi of the five zang organs cannot emerge without it. The Spleen and Stomach, located in the central jiao (Middle Burner), rely on Fire to generate, but it must be that the Spring Qi of Shaoyang (Lesser Yang) begins to rise from below, so that the Three Yang channels rise with the earth's qi, allowing all things to be transformed and generated. Is this not proof that the Yang Qi of the Mingmen is indeed the mother of the Spleen and Stomach? Therefore, I say: The Spleen and Stomach are the root of infusion and distribution, obtaining Post-Heaven Qi; the Mingmen is the source of transformation and generation, obtaining Pre-Heaven Qi. There is inherently a sequence of origin and branch between them. Li Dongyuan stated that tonifying the Kidney is inferior to tonifying the Spleen, but one should know that it can also be said that tonifying the Spleen is inferior to tonifying the Kidney; this is clear without needing further debate.

However, there is "fire intensity" (Huo Hou) in the Mingmen, which refers to Yuan Yang (Primordial Yang). Constitution varies in strength, Yuan Qi varies in abundance or decline, Yin and Yang have dominance or subordination, and disease treatment has severity or mildness; these require discernment of appropriate fire intensity. Generally, the Primordial Yang Qi arises from below and ascends; the protective function of the San Jiao (Triple Burner) manifests differently in each region. The manifestation of the Lower Burner is like the earth and soil, the root of transformation and generation; the manifestation of the Middle Burner is like a stove or cauldron, the furnace for cooking water and grain; the manifestation of the Upper Burner is like the vast sky, the dwelling place of divine spirit.

Soil varies in fertility, leading to different produce; mountains and rivers vary in depth and thickness, leading to different storage capacities. The control of gathering and dispersing lies entirely with Yang Qi. Gaining one part of Yang yields one part of utility; losing one part of Yang results in one part of deficiency. Longevity or brevity of life, courage or timidity, and the foundation of treating diseases involving essence and blood all stem from this. Whether Yuan Yang is sufficient or insufficient serves as the master of increase, decrease, fullness, and emptiness; this is what is meant by the fire intensity of the Lower Burner.

The Middle Burner is like a stove or cauldron; the Yang Qi in the Stomach generates heat like a pot. Nourishment from food and drink originates from water and grain. Abundant food leads to a strong body; scarce food leads to physical decline. If a stove lacks even one torch, digesting a large amount takes longer; adding one torch speeds up digestion. If firepower does not reach, nothing is digested at all. Thus, whether the Spleen and Stomach can transform and whether food can be utilized depends entirely on whether the Yang Qi of the Yangming (Stomach Channel) is strong or weak, and whether pathogenic cold-yin invades or not. Once illness occurs, symptoms may include gradual bloating and distension, dysphagia or vomiting, abdominal swelling and accumulation that does not resolve, acid regurgitation or belching with rotten smells, unchanged food odor, abdominal pain, lack of hunger all day, failure to separate clear and turbid, or undigested food in stool. Generally, if transformation occurs, there is no stagnation; if transformation fails, there is retention. Proper operation becomes Qi and Blood; retention becomes Accumulation and Phlegm. This is what is meant by the fire intensity of the Middle Burner.

The Upper Burner is like the vast sky; divine spirit is rooted in Yang Qi, and Yang Qi transforms into spiritual awareness. When Yang is below, it provides warmth, hence it is said that Minister Fire (Xiang Huo) resides in its proper position. When Yang is above, it provides brightness, hence it is said that Sovereign Fire (Jun Huo) is clear. Therefore, when Yang grows and Yin declines, the five sense organs function properly and all species flourish. If Yang declines and Yin prevails, crushing Yang, intelligence is lost and divine spirit diminishes; this is what is meant by the fire intensity of the Upper Burner.

Discussing fire intensity via the San Jiao implies that each has its specific functions, but only the Mingmen actually stores the Pre-Heaven True One Qi within Kan (Water trigram). From below upwards, it connects with Post-Heaven Stomach Qi, forming the root of life. If True Yang does not emit from the abyssal spring, it remains merely unrooted fire.

Fire without a root is pathogenic Qi, not Yuan Qi. The *I Ching* uses Thunder under the Earth to symbolize Fu (Return), showing that the manifestation of fire is above, while its root is below. If Mingmen Yin prevails, Yuan Yang retreats in fear, leaving Dragon Fire (Long Huo) with no place to hide. It wanders and scatters, causing syndromes such as vexing heat or floating Yang (Ge Yang). Those skilled in treating this follow its nature, allowing harmonious Yang Qi to enter Kan directly, seeking its kindred energy, so that floating Yang returns to its origin. Hence, sweet-warm herbs can eliminate great heat, which is precisely what this means. Ignorant people fail to understand this principle, mistaking floating Yang for excess heat. Instead of warming and nourishing this fire, they only know that cold-cool herbs extinguish fire, expecting it to retain vitality? If there are guest heat or pathogenic fire in the San Jiao, these are ordinary fires and must indeed be removed. Removing such fire is not difficult, as they do not belong to the righteous Qi fire intensity.

Moreover, the Mingpossession of Sheng Qi (Vital Qi) is the mechanism of endless movement in Qian Yuan (Heavenly Primal Qi). Endless movement implies activity and ascent, thus Yang obtains vital Qi. Rest implies stillness and descent, thus Yin obtains death Qi. Therefore, Qian Yuan Qi begins below and peaks above; ascending leads to life. Kun Yuan (Earthly Primal Qi) begins above and peaks below; descending leads to death. This divergence of Yin and Yang differs by less than a hair but results in a distance of a thousand miles. Thus, the handle of life and death lies in this minute mechanism of ascent and descent. For example, warm water transforms into vapor; vaporization is ascent, representing life. Cold water forms ice; freezing is descent, representing death. Therefore, if Kidney Qi sinks alone, the force supporting life is reduced, illustrating the principle of vital Qi.

As for human vital Qi, it is everywhere: in Zang Qi, complexion, voice, pulse and respiration, limbs, and urination and defecation. Vital Qi is Divine Spirit (Shen); Shen arises from form, so how can it not be discernible? Wise individuals observe it: who can enhance vital Qi, and who can damage it? Should one first attack pathogenic Qi to protect vital Qi, or first consolidate vital Qi to resist pathogenic Qi? Without clarity on tracing origins and examining endings, one is merely short-sighted.

Generally, the Mingmen has gates, serving as the critical pass for consolidating the whole body. The Classics state: "If the granaries do not store, it is because the gates are not secured; if spring waters do not stop, it is because the Bladder does not store." Retaining security brings life; losing security brings death. It is also said: "The Kidneys are the gate of the Stomach; if the gate is obstructed, water accumulates following its kind." It is also said: "Black corresponds to the Kidney, opening into the two yin orifices." Thus, the master of the North (Lower Body) lies in the Kidney, and the administration of the Kidney lies in the Mingmen.

The Mingmen holds the authority over Yin and Yang. When Yin and Yang are harmonious, entry and exit follow regular patterns; when Yin and Yang are diseased, opening and closing are disordered. Thus, some experience urinary retention (Long Bi) due to exhaustion of Yin and drying of fluids, where dryness prevents flow. Others experience involuntary slipping or leakage due to Yang deficiency and fire failure, where retention lacks mastery. If Yin Essence is exhausted, strengthening Water (nourishing Yin) is necessary for flow; if Yang Qi is deficient, benefiting Fire (tonifying Yang) is necessary for consolidation. These are the therapeutic methods.