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Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.
叶公问子路:孔子是怎样的人,子路不回答。孔子说:“你怎么不说:他这个人啊,发愤学习就忘记吃饭,高兴起来就忘记了忧愁,不知道快要变老了等等?”