This sentence comes from Chairman Mao. Chairman Mao adapted the ancient saying "fullness brings harm, modesty benefits" in "Shang Shu. Dayu Mo" from ancient times to today.

About the author: Mao Zedong (December 26, 1893 - September 9, 1976), whose pseudonym was Runzhi (originally Yongzhi, later changed to Runzhi), and his pen name Ziren. A native of Xiangtan, Hunan. Leader of the Chinese people, Marxist, great proletarian revolutionist, strategist and theorist, main founder and leader of the Communist Party of China, the Chinese People's Liberation Army and the People's Republic of China, poet, calligrapher Home.

Meaning: If you learn from others' strengths with an open mind, you will be able to gain something and make progress; if you are complacent and self-righteous, you will not be able to learn from others' advanced knowledge and experience, and will be left behind by others.