Origin: Ming Li Shizhen, "Compendium of Materia Medica - Human One - Human Essence": "The essence of Yingqi is transformed into essence, which is gathered in the life gate. The life gate is the house of essence and blood."

Mao Dun, "Polygamy," 4: "This human essence, I guess she must come in the next few days."

Positive:

①long-lived old man ②particularly intelligent and clever child.

Depreciative: ①A person who is old and sophisticated. ② a particularly shrewd and calculating person