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The Tang Dynasty essayist Liu Zongyuan was demoted to Sima of Yongzhou in Hunan after Wang Shuwen lost power. During his time in Yongzhou, he received a letter from Wei Zhongli requesting to become his student, which deeply moved him.
He immediately wrote a reply, 'Letter to Wei Zhongli Discussing the Role of a Teacher,' expressing a viewpoint: it is common to be surprised by the unfamiliar, and 'Shu dogs barking at the sun' is a typical example.