The swan song of a historian is a rhymeless dissatisfaction." This famous saying about "Historical Records" comes from Lu Xun's "Outline of the History of Chinese Literature".
Additional explanation:
This sentence was said by Lu Xun in Chapter 10 of "Outline of the History of Chinese Literature", "Sima Xiangru and Sima Qian": "I hate being a jester, I send my heart to Chu Mo, I feel the humiliation of my life experience, and I pass it down to the deviant people for thousands of years. Although it recites the meaning of "Spring and Autumn", it can still be regarded as the swan song of historians, "Li Sao" without rhyme. "
"Outline of the History of Chinese Literature" is Lu Xun's lecture notes on the history of Chinese literature at Xiamen University in 1926. It was included in "The Complete Works of Lu Xun" in 1938.