Not keeping promises means that people who don't keep promises can't stand in society. Explain that you can't stand up in society and get recognition from others. From Zuo Zhuan Twenty-two Years of "xianggong".
Zuo Zhuan is an old biography written by Zuo Qiuming in the Spring and Autumn Period, which is considered to be from the Warring States Period. It is a chronological history book with complete narrative in ancient China, and it is also a representative of prose works in the pre-Qin period.
The original name of the work was Zuo's Spring and Autumn Annals, and later it was renamed Zuozhuan in Chunqiu Zuozhuan and Hanshu Zuozhuan, and it was often called Zuozhuan after the Han Dynasty. It is one of the important Confucian classics, and it is also an important study history book for Confucian students in past dynasties. It is also called "Three Biographies of Spring and Autumn" with Biography of Ram and Biography of Gu Liang.
In essence, Zuo Zhuan is an independent historical document, which began in the year of Lu Yin (722 BC) and ended in the twenty-seventh year of Lu Aigong (468 BC). Based on Chunqiu, this paper illustrates the outline of Chunqiu by describing the specific historical facts in the Spring and Autumn Period.
Zuo Zhuan represents the highest achievement of pre-Qin historiography, is an important document to study pre-Qin history and Spring and Autumn history, and has a great influence on later historiography, especially on establishing the status of chronological history books.
Because it has a strong Confucian tendency, emphasizes hierarchical order and patriarchal ethics, pays attention to the distinction between honor and inferiority, and also shows the idea of "people-oriented", it is also an important historical material for studying Confucianism in the pre-Qin period.