What you want to ask is, failure in life is either arrogance or laziness, so where does diligence come from to eliminate all disadvantages? A letter from Zeng Guofan. According to the query "Zeng Guofan's letter", the content shows. The failure of life is either arrogance or laziness, and diligence will eliminate all disadvantages. It means that the reason for failure in life is either arrogance or laziness, and it must be one of them. Even if a person has many shortcomings and deficiencies, these problems can be solved as long as he is diligent enough. Letters from Zeng Guofan is a collection of Zeng Guofan's letters in the middle of Qing Dynasty19th century. This collection of letters records Zeng Guofan's Hanyuan career and military career from 30 years of Qing Daoguang to 30 years of Tongzhi 10, with nearly 500 letters.