《宋书·列传·卷六十》
我知道楮等恶木的去除，不一定是人用刀斧去砍的，楚昭王仁爱，不祭神病却好了。卓茂去除无知之虫，宋均囚禁有异常征兆的老虎。出现蝗虫是有原因的，不该扑杀。
臣闻桑谷时亡，无假斤斧，楚昭仁爱，不絜自瘳，卓茂去无知之虫，宋均囚有异之虎，蝗生有由，非所宜杀。
I know that removing evil trees such as mulberry, is not necessarily done by people with axes and hatchets. King Zhuang of Chu was benevolent and did not sacrifice to the gods, but his illness was cured. Zhuo Ma got rid of ignorant insects, and Song Jun imprisoned tigers that showed signs of abnormality. The appearance of locusts has a reason and they should not be killed.