《论衡·卷十三·效力篇》
王莽的时候，删定五经的解说，每经都是二十万字，年轻博士郭路晚上删定原来五经的解说，死在灯烛之下，这是因为精力智慧不能胜任，血脉枯竭元气不存的缘故。
王莽之时，省《五经》章句皆为二十万，博士弟子郭路夜定旧说，死於烛下，精思不任，绝脉气减也。
In Wang Mang's reign, the commentaries of the Five Classics were revised, each classic contained 200k words, the young doctor Guo Lu revised the commentaries of the original Five Classics at night, and died under the candlelight, this was because his mind and wisdom could not cope with it, and his blood and essence were exhausted.