"Can't let a day be idle" comes from Qi Baishi.

Qi Baishi was 85 years old. One day he painted 4 paintings without taking a break. After finishing the painting, he wrote: "It was windy and rainy yesterday, and I felt restless. I did not paint. I will make up for it today. I will not teach for a day." It’s too late.”

Qi Baishi (January 1, 1864 - September 16, 1957), a native of Xiangtan, Hunan, is a contemporary Chinese traditional Chinese painter. Her original name was Qi Chunzhi, with the courtesy name Wei Qing. Her grandfather named her Lanting, her teacher named her Qi Huang, and her nickname was Bisheng. She was also nicknamed Old Man Jiping and Baishi Shanren. Later generations often omitted the word "Shanren", so she was often nicknamed "Shanren". White Rock". Qi Baishi and Zhang Daqian were also called "Southern Zhang and Northern Qi".