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The *Classic of Difficult Issues* (referring to *Huangdi Neijing*) states: "One who possesses Shen (Spirit/Vitality) prospers; one who loses Shen perishes." The significance of Shen is indeed profound; it is the root of life and death, and must be carefully examined.

Regarding pulse diagnosis, the pulse must possess Shen. The *Pulse Methods* state: "Strength within the pulse indicates the presence of Shen." By strength, it does not mean robustness or excessive force, but rather a moderate and harmonious power. Generally, if there is strength without losing softness and moderation, and softness without losing underlying strength, this constitutes the Shen of the pulse. If the strength is insufficient, it manifests as weak, faint, or severed—lacking force. If the strength is excessive, it manifests as wiry, hard, and rigid—the force of the True Zang pulses. Both conditions indicate an absence of Shen and are ominous signs of danger.

Regarding physical manifestations, if the eyes are bright and lustrous, speech is clear and resonant, mental clarity is intact, muscles are not emaciated, respiration is normal, and urination and defecation are controlled, such cases, even if the pulse is questionable, need not be feared, because the Shen of the form remains. However, if the eyes are dim and gaze is confused, the body is emaciated and complexion is ruined, panting is abnormally urgent, diarrhea is unceasing, or the large muscles of the whole body have wasted away, or the hands involuntarily grasp at clothes and beds, or there is incoherent speech without external pathogens, or hallucinations of ghosts without disease, or abdominal distension where neither tonification nor purgation can be applied, or cold-heat disorders where neither warming nor cooling therapies are suitable, or sudden acute illness leading to deep coma and irritability with loss of consciousness, or sudden collapse with closed eyes, open mouth, relaxed hands, and urinary incontinence—in such cases, even if the pulse shows no ominous signs, death is certain because the Shen of the form has departed.

Regarding treatment methods, when herbs and food enter the Stomach, their ability to overcome pathogens depends on the Stomach Qi distributing the medicinal power, thereby enabling warm, emetic, diaphoretic, or purgative actions to expel the pathogen. If the pathogen is strong and Stomach Qi is exhausted, even if decoctions are ingested, the Stomach Qi cannot transform and distribute them. In such a case, what could be done even with miraculous elixirs? Therefore, there are instances where cold-natured herbs fail to produce a cooling effect, and heat-natured herbs fail to produce a warming effect; where sweating fails to resolve exterior symptoms, and moving stagnation fails to address interior symptoms; where deficiency patterns cannot tolerate tonification, and excess patterns cannot tolerate attack; where herbs and food cannot be swallowed, or are vomited immediately upon swallowing. In such cases, the patient does not respond to calls and cannot be moved by pushing, indicating that the Zang organ Qi and Yuan Shen (Primal Spirit) have completely departed, leaving nothing to direct. This represents another category of certain death beyond the scope of pulse and symptom analysis.

Nevertheless, although the Shen of pulses and symptoms may seem fully described above, there are cases where a heavy (ominous) pulse but light (mild) symptoms suggest survival, and cases where a light (auspicious) pulse but heavy (severe) symptoms suggest death; these rely on symptoms rather than the pulse. Conversely, there are cases where severe symptoms but a light pulse suggest survival, and cases where mild symptoms but a heavy pulse suggest death; these rely on the pulse rather than symptoms. Between these ambiguous choices lies a profound subtlety. Indeed, the concept of Shen is difficult to articulate. One who understands the nuances of Shen’s urgency and timing is likely a physician of divine skill.