This sentence comes from the multi-volume chronological history book Zi Tongzhi Jian edited by Sima Guang, a historian of the Northern Song Dynasty, with a total of 294 volumes, which took 19 years to complete. It mainly takes time as the key link and events as the purpose, covering the history of sixteen generations, from the twenty-third year of Wei Lie's Zhou Wang to the six-year conquest of Huainan by Zhou Shizong Xiande after five dynasties, 1, 362 years.
In this book, the editor summed up many experiences and lessons for the rulers to learn from. Song Shenzong thinks that this book is rich in learning from history, that is, learning from historical gains and losses, so as to strengthen the rule, so it is named "Learning from Resources". Zi Tong Zhi Jian has 294 volumes, more than 3 million words and 30 volumes of textual research catalogue.
Creative background:
Mirror Mirror was composed by Sima Guang and co-edited by Liu Shu, Liu Ban and Fan Zuyu. Liu Shu learned from others and had a deep memory. He tried his best to compile A Mirror, from Xiashi in Historical Records to Zayan in Private Records. Liu Ban and Fan Zuyu in Hanshu have made deep research and made important contributions to each other.
Finally, Sima Guang revised and polished it into a final version, in which right and wrong were taken away and there was no light in one place. There are abundant historical materials in Tongjian, besides Seventeen History, there are hundreds of miscellaneous history books. The narratives in books are often written in several materials. In those years, when there are differences in deeds, all of them are added to the textual research, and the reasons as appropriate are indicated, which is regarded as "textual research".
Refer to the above content: Baidu Encyclopedia-Purple Tongzhi Sword