My calligraphy students should not be good doctors who help the world, but also be good doctors who help others. Who wrote this couplet? Old egg yolk salt bath is innocent of five risks.

Fan Zhongyan, a famous minister in the Northern Song Dynasty, was ambitious since childhood and took the world as his responsibility. Fan Zhongyan has a cloud: "Nothing can benefit the people of the world better than being a prime minister;" If you can't be a prime minister, nothing can benefit the people more than being a doctor.