In Bing Xin's article "Leisure", it is mentioned that "a friend wrote to me to express his condolences and said: "Dongbo said, 'It is not bad to have leisure because of illness.' I am also a person who is good at illness. , so I know that being able to be idle is really a big effort, and it is a great question. ..."" comes from Su Shi's poem "It is not bad to be free from illness, peace of mind is the medicine, let alone prescription." It refers to the spiritual effect (peace of mind and peace) that can make people enjoy suffering and filter out happiness from illness.