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A question was asked: "Medicines of metals and stones, when buried, do not rot; when boiled, do not disintegrate. Their use can consolidate Qi (vital energy) and prolong life. However, herbal medicines from plants inevitably rot. How can they possess the power to consolidate and sustain?"

The answer was: "The nature of metal and stone medicines is fierce and harsh, lacking the moistening quality of body fluids. When a person takes such medicines during their prime, no harm is seen; but when they become weak, the toxicity manifests. In youth, abundant Qi can control it, and vigorous Blood can circulate it, so it does not manifest. However, when Qi becomes deficient and Blood declines, neither control nor circulation is possible. Toxicity accumulates in the Zang-Fu organs, giving rise to major disasters. Where is there any consolidation or longevity?"

Another question arose: "There are cases where 'stone eruption' (toxic heat reactions caused by taking mineral drugs) occurs even before weakness sets in. Why is this?"

The answer was: "If sorrow and anger reside in the heart, causing Qi and Blood to fail to flow smoothly, and Ying (Nutritive) and Wei (Defensive) energies to become stagnant, the mineral substances cannot be metabolized. Heat knots and fails to dissipate, manifesting as various sores and abscesses at the site of accumulation. Furthermore, those who take stone medicines may rely on the drug's heat to indulge in sexual activity, or depend on the drug's momentum to consume rich and fatty foods, believing these to be miraculous effects. Unaware that their essence and fluids are secretly depleted, fierce heat arises like a prairie fire, rarely leaving anything but scorched earth."

Another question was posed: "Given such severe harms from metals and stones, why did Shennong (the Divine Farmer) list them in the *Shennong Bencao Jing* (Divine Farmer's Materia Medica)?"

The answer was: "For individuals with extreme deficiency and accumulated cold, temporary use is permissible. Once the illness is cured, one should stop, and there will be no harm."

Another question followed: "Stone medicines have a fierce nature and manifest toxicity when Zang-Fu organs decline. If a patient is first deficient and then takes stone medicines, how can they control the drug's potency? Moreover, why is no harm observed?"

The answer was: "When a person first takes the medicine, the drug's potency has not yet accumulated. Additionally, since the patient's constitution is already deficient and cold, how could it manifest?"

Another question was raised: "Plant-based herbs cannot last long themselves; how can they benefit human lifespan?"

The answer was: "If taken continuously without fatigue, the medicinal forces connect and accumulate over years, surely yielding great benefits. Medicines for attacking pathogens achieve merit through the resolution of disease; formulas for consolidation and sustenance achieve efficacy through a sense of peace and comfort. With both form and spirit tranquil, lifespan will daily increase."

In medicine, balance is prized; one must avoid excess and deficiency. Using medication insufficiently is like using a weak bow to hunt beasts beyond a hundred paces, or like trying to extinguish a fire on a cartload of firewood with water from a small measure; it will certainly be of no help. Using medication excessively is like shoring up a house with too much force, damaging the beams and pillars; or like drinking to excess, resulting in vomiting and prostration, offering no benefit—only harm is seen. These two approaches seem plausible but are actually erroneous; physicians must understand this.

Treating diseases generally follows fixed principles: exterior before interior, attack before tonify, root before branch, Qi before Blood. However, there are exceptions: treating interior before exterior (e.g., using Chengqi Decoction to purge downward when measles/rash fails to erupt); treating exterior and interior simultaneously (e.g., using Da Chaihu Decoction for Shaoyang-Taiyang combined syndrome); tonifying before attacking (ancients often used this for large accumulations); combining attack and tonification (e.g., Zhizhu Wan, Huanglong Tang); treating branch before root (as in 'in acute conditions, treat the branch first'); addressing both root and branch simultaneously (e.g., Renshen Suxin Yin, Renshen Baitu Tang); treating Blood before Qi (e.g., using Chengqi Decoction followed by Baitu Tang); and treating and tonifying both Qi and Blood simultaneously (e.g., Tongsheng San, Bazhen Tang). Physicians must also be aware of these variations.