《韩非子·八经》
外国暗中安插官吏的情况一旦发生，君主就要追查和惩办与之关系密切并接受贿赂的人，臣子就不敢借助于外国势力了。君主按照功劳赏赐爵禄，对于无功而请求爵禄的人，连同替他请求的人一起办罪，左右侍从也就不会成为臣子作乱的凭借了。
外国之置诸吏者，结诛亲暱重帑，则外不籍矣；爵禄循功，请者俱罪，则内不因矣。
Once the king finds out that external forces have secretly installed people in official positions, he should search for and punish those who have close relationships with them, and who have accepted bribes; then his subjects would not dare to make use of foreign forces. The ruler should bestow ranks and salaries according to merit, for those who request ranks and salaries without providing any merit, and even the person who makes the request on his behalf, will be punished; then the people in service will not become ways for the subjects to create unrest.