One famous philosopher, Kong Zi, lived and worked in China from 551 BC to 479 BC.
公元前551年至公元前479年，著名哲学家孔子在中国生活和工作。
Kong Zi: cloud at forty and perplexed, fifty to know your destiny.
孔子云：三十而立，四十而不惑，五十而知天命。
The person of rationalness : the period from Tao Yuanming to Kong Zi is the changing stage.
平静而黯淡的笔触：从陶渊明到孔子。 这是转向阶段。
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