唐朝李匡文《资暇集》有一篇文章叫《拆封刀子》,读来颇堪玩味:"郭汾阳虽度量廓落,然而有陶侃之僻,动无废物。每收书皮之右嫠下者,以为逐日须,至文帖余悉卷贮。每至岁终,则散与主守吏,俾作一年之簿。……一日,(部吏)所用嫠刀忽折,不余寸许。吏乃铦以应召,觉愈于全时。渐出新意,因削木如半鐶(环)势,加于折刃之上,使才露锋,榼其书而嫠之。汾阳嘉其用心,曰:‘真郭子仪部吏也。’时人遂效之,其制益 Li Kuangwen Tang Dynasty << Capital leisure set >> an article called << Chai Feng knife >> reads quite pondering pondering: Although Guo Fenyang measured profile, however, there are Tao Kan secluded, moving without waste. , That day by day, until the text posts Yu volumes .Every year-end, then scattered with the main official officials, serve as a year book .... On the 1st, (ministers) trowel used to break, Man Na 铦 to call, feel more full time. Gradually new ideas, due to cut wood, such as half 镮 (ring) potential, added to the folding blade above, so that Lu Feng, 榼 ​​its book 嫠 嫠 Fenyang Jia Ji intentions, saying: ’really Guo Ziyi department officials also.’ When people then effect, its system of benefits