This sentence comes from Han Meicheng's "Writing the King of Wu": "Soup is useless, one person cooks it, and a hundred people raise it; It is better to leave without pay. " "The Biography of the Three Kingdoms Shu Wei Liu Gan": "Raise the soup to stop boiling, so that it is not burnt." . The method of metaphor is not thorough and can't solve the problem fundamentally.

Nourishing soup to stop boiling and "drinking poison to quench thirst" both mean "only paying attention to the present" and "the method is not thorough"

The difference lies in the metaphor of "lifting soup to stop boiling", which can not fundamentally solve the problem; And "drinking poison to quench thirst" is a metaphor to solve the current difficulties without considering the seriousness of the consequences.

Liu Kun was wei ren in the Three Kingdoms period. His brother hoped for it and was killed by Liu Biao, the secretariat of Jingzhou. He defected to Cao Cao and worked as a secretary and other officials under Cao Cao. Liu Xun was brilliant and studious, and was highly valued by Cao Cao and his eldest son Cao Pi. At that time, a man named Wei Yan opposed Cao Cao and attacked him. After being denounced, Cao Cao put Wei Yan to death. Liu Xun's younger brother Liu Wei was an accomplice of Wei's satirical plot against Cao Cao, so he was also killed by Cao Cao. According to the law at that time, Liu Kuang was also convicted because of his brother's involvement, which should be copied by the whole family. But Cao Cao cherishes talents, and at the same time understands that Liu Kuang and his younger brother Liu Wei are fundamentally different. According to the review, Liu Kuang also persuaded Liu Wei not to satirize Wei. Therefore, Cao Cao ordered Liu Xun to be pardoned and not convicted. Liu Kun is very grateful to Cao Cao. To this end, he wrote a letter to Cao Cao. In one paragraph of the letter, he wrote: "My sin should be to destroy my ancestors and family. Fortunately, you saved my life and my family's. Such great kindness can never be repaid. I will only serve you until I die. " "Raise the soup to stop boiling" refers to spreading the boiling soup (boiling water) in the pot to make it slightly cool and not boil for the time being, which means that things are urgent and difficult. But later when people used this idiom, the original meaning changed. Generally speaking, people use metaphors to take emergency measures temporarily, but they can't solve the problem fundamentally and the description method is not thorough enough.