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I want to stand as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center.
孔子说:“我十五岁立志于学习,三十岁有所建树,四十岁不困惑,五十理解自然规律,六十明辨是非,七十随心所欲,不违规。”