杜甫's 《
春望》 line
烽火连三月,
家书抵万金 (beacon fires have burned three months; a letter from home is worth ten thousand in gold) is the word's most famous use. Famous collections carry it in their titles: 《
曾国藩家书》, the letters of the Qing statesman
曾国藩, and 《
傅雷家书》, the translator
傅雷's letters to his son, the pianist
傅聪.