《黄帝内经·灵枢·论勇》
少俞回答说：能否忍耐疼痛，是根据皮肤的厚与薄，肌肉的坚实与脆弱，以及纵缓与紧密的不同，不是根据性格的勇敢和怯懦来区分。
少俞曰：夫忍痛与不忍痛者，皮肤之薄厚，肌肉之坚脆、缓急之分也，非勇怯之谓也。
Shaoyu replied: The ability to endure pain is based on the thickness and thinness of the skin, the firmness and fragility of the muscles, and the different longitudinal, slow, and tightness, not based on the bravery and cowardice of the personality.