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。
It has been constantly disputed among scholars that who is the original author of the four poems and two letters with signature of Kong Zang in Kong Cong Zi and when they were written.
今《孔丛子》中所存题名为孔臧的四赋二书，其作者和写作时间历来多为学者们所质疑。
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