“I examine myself three times a day” is what Zengzi said.

From "The Analects·Xueer". The author of this sentence is Zengzi in the Spring and Autumn Period. Zengzi, also known as Zengcan, also named Ziyu. Descendants of the State of Zuo, natives of Nanwucheng of the State of Lu, are descendants of the nobles of the State of Zuo who were destroyed. Zeng Shen was a favorite disciple of Confucius and was known as a filial son.

Original text: Zengzi said: "I have to examine myself three times every day: Have I been unfaithful in my plans for others? Have I not trusted my friends in my dealings? Have I not been accustomed to teaching them?"

Translation: Zengzi said : "I reflect on myself many times every day: Have I tried my best to do things for others? Have I been honest in my interactions with friends? Have I personally practiced the knowledge I passed on to others?"

I examine myself three times a day, and it turns out that It refers to checking oneself from three aspects every day, and later refers to checking oneself consciously many times. It talks about attitude and emphasizes the importance of self-reflection.

"Xueer" is the title of the first chapter of "The Analects of Confucius". Each chapter in "The Analects of Confucius" generally uses the first two or three characters of the first chapter as the title of the chapter. One chapter of "Xueer" includes 16 chapters, covering many aspects. The key points are "I should examine myself three times in a day", "Be frugal in use and love others so that people can use their time", "Harmony is the most precious thing in the use of etiquette", involving moral categories such as benevolence, filial piety and trustworthiness.