The Trouble of Playing the Teacher

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孟（mèng）子（zǐ）曰（yuē）：（）“（）人（rén）之（zhī）患（huàn）在（zài）好（hào）为（wéi）人（rén）师（shī）。（）”（）

Mencius said, “A common human failing is the eagerness to set oneself up as other people’s teacher.”