Zeng Guofan's theory of "making friends" and "making eight friends without making nine friends": "making eight friends" is better than yourself; A person of noble character; Interesting people; Willing to endure hardships; An outspoken speaker; An open-minded person; The advantage lies in being a teacher by example and being a teacher by example. "Don't pay" people with different aspirations; Defamation; Those whose grievances are reversed; A person who takes advantage; A person without temperament; Unfortunately and ungrateful; Fool; A down-and-out person; Those who are virtuous and thin.