相火命门君火心，二火一水难相均（惟青属水，《内经》所谓一水不能胜二火）。五脏气
升皆是火（气有余便是火），须知妄动炼真阴（《内经》又云∶一水不胜五火也）。心火亢枉阳
强病，人壮气实咸冷进。癫狂便闭承气汤，大便如常解毒应（治火热错语，呻吟不眠，烦躁
脉数，干作呕恶）。实火可泻从上方，随经调治须更定。饮食劳倦身发热，元气不足内伤症。
补中益气味甘温，阳虚之火功偏胜。相火炽甚以乘阴，朝凉暮热血虚成。阴中之火甘寒降，
知柏四物功堪称。肾水受伤阴虚病，面红耳热浮火乘。左尺洪数无根火，龟柏六味治如神
（以上补虚火法）。胃虚过食生冷物，阳气抑过不得伸，火郁之症升散好，升阳散火用之灵。
命门火衰阳脱病，面赤烦躁虚火盛。足冷脉沉阴极燥，回阳救急医中圣，六君桂附五味姜，
猪胆麝香加可进。阴虚发热火旺甚，脉数无力属心肾。内伤发热乃阳虚，脉大无力脾肺分。
气从左起肝之火，阴火还从脐下引。脚下热来侵腹者，斯人虚极药难问。治火之法始知凉，
次而寒取效可望。寒取不效从热之，从之不效心茫茫。是徒知热以寒治，至理尚未经细详。
不知火热不能退，总由真水不能长。妙法壮水以为主，壮水自克制阳光。寒而热者取之阴，
阴即肾水经言彰。肾水既足心火降，火非水偶谁能当（回阳救急汤、六君加附、桂、干姜、五
味子、麝香、猪胆汁）？
Ministerial fire (Xianghuo) originates from the Gate of Life (Mingmen), while Sovereign fire (Junhuo) resides in the Heart. It is difficult for these two fires to remain balanced with Kidney water (only the color green belongs to Water, as stated in the *Huangdi Neijing*: "One Water cannot overcome Two Fires"). The ascending Qi of the Five Viscera all transforms into Fire (excess Qi becomes Fire); one must understand that reckless movement refines True Yin (the *Neijing* also states: "One Water cannot overcome Five Fires"). When Heart Fire is hyperactive causing Yang excess and disease, individuals who are robust and have substantial Zheng Qi may take salty-cold remedies. For mania and constipation, Chengqi Tang (Cassia Twig Decoction) is used; if stool is normal, Jiedu Ying (Toxin-Resolving Response) is indicated (treating heat-fire causing delirious speech, groaning, insomnia, irritability, rapid pulse, and dry retching). Excess Fire can be purged from the Upper Jiao, but treatment must be adjusted according to the affected meridians. Fever resulting from diet and overwork belongs to internal injury due to insufficient Yuan Qi. Buzhong Yiqi Tang (Spleen-Raising and Qi-Supplementing Decoction), with its sweet and warm nature, is effective for cases where Yang-deficient Fire prevails. When Ministerial Fire is blazing and attacking Yin, it manifests as coolness in the morning and fever in the evening, constituting Blood deficiency. Fire within the Yin should be descended using sweet-cold herbs; Zhibai Siwu Tang (Anemarrhena, Phellodendron, and Four Substances Decoction) is highly efficacious. Injury to Kidney Water leads to Yin deficiency, presenting with facial redness, ear heat, and floating fire. A flooding, rapid, rootless pulse at the left Chi position indicates deficient fire, treated effectively with Guiban Liushen Wan (Tortoise Shell and Six-Ingredient Pill with Rehmanniae Radix Preparata, Phellodendri Cortex, etc.) (The above methods treat deficient fire). If Stomach Qi is weak and excessive consumption of cold/raw foods suppresses Yang Qi preventing its extension, this is a Fire-Stagnation syndrome, best treated with dispersing and ascending methods; Shengyang Sanhuo Tang (Yang-Raising and Fire-Dispersing Decoction) is effective. Decline of Mingmen Fire leading to Yang collapse presents with facial flushing, irritability, and abundant deficient fire. Cold feet, deep pulse, and extreme Yin dryness indicate the use of Huiyang Jiujii Tang (Decoction to Restore Yang and Rescue from Crisis), a sage formula in medicine, composed of Liujun Zi Tang (Six-Gentlemen Decoction) plus Fuzi (Prepared Aconite Root), Guizhi (Cinnamon Twig), Wuweizi (Schisandra Fruit), Ganjiang (Dried Ginger), with added Zhudans (Pig Gallbladder Juice) and Shexiang (Musk). Deficient Yin with fever and vigorous fire, characterized by a rapid but forceless pulse, involves the Heart and Kidney. Internal injury fever due to Yang deficiency shows a large but forceless pulse, localizing to the Spleen and Lung. Fire arising from Qi moving from the left side is Liver Fire; Yin Fire is often drawn from below the navel. Heat rising from the soles invading the abdomen indicates extreme deficiency, making treatment difficult. To treat Fire, one initially knows to use cooling methods, then cold methods for expected efficacy. If cold methods fail, switch to hot methods; if that fails, confusion ensues. Merely knowing to treat heat with cold and cold with heat means the profound principles have not been thoroughly examined. The reason heat-fire cannot be subsided is ultimately because True Water has not grown. The exquisite method is to primarily strengthen Water; strengthening Water naturally controls the Solar Flare (hyperactive Yang). If cold treatment results in heat, treat from the Yin perspective; Yin refers to Kidney Water, as clarified in the classics. Once Kidney Water is sufficient, Heart Fire descends; without Water to couple with it, who can withstand the Fire? (Huiyang Jiujii Tang; Liujun Zi Tang plus Fuzi, Guizhi, Ganjiang, Wuweizi, Shexiang, Zhudans)