《资治通鉴·汉纪·汉纪十九》
而今，称臣于汉，则得以安全生存；如果不肯屈服，必陷于危亡境地。还有什么计策比这更好呢？ 
今事汉则安存，不事则危亡，计何以过此！ 
If we become subjects to the Han now, we can survive; if we refuse to do so, we will be certainly in danger. What plan can be better than this?