He wrote in his letter: "The autumn wind has risen again, and I find myself longing for home."
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From 《世说新语》: in the Western Jin, 张翰 was serving in Luoyang when the autumn wind made him long for the water shield soup and perch of his home in Wu, so he resigned and went home. 莼 is water shield (莼菜), 鲈 is perch.