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Zheng Xuan (127–200 CE) was a preeminent Confucian classicist of the Eastern Han dynasty. His courtesy name was Kangcheng, and he was a native of Gaomi, Beihai Commandery (in present-day Gaomi, Shandong).
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The Master said, “In ancient times, scholars studied to cultivate themselves; nowadays, scholars study to impress others.”