'Do not forget the days in Ju' urges one not to forget hard times.
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history
莒 was a small Zhou-era state, conquered by Chu in 431 BC; its name survives in 莒县 (Ju County, Shandong). The phrase 毋忘在莒 ('do not forget the days in Ju') recalls a prince's exile there and means never forgetting one's hardships.