《资治通鉴·汉纪·汉纪十一》
卜式说： 天子征讨匈奴，我认为有才能的人应战死边塞以全臣节，有财的人应拿了钱财支援国家。这样才能将匈奴消灭。 
式曰： 天子诛匈奴，愚以为贤者宜死节于边，有财者宜输委，如此而匈奴可灭也。 
Bu Shi said: The emperor is conquering the Hun. I believe that talented people should fight to their deaths at the border to protect the honor of the officials, and the wealthy should contribute their money to support the country. That is how we can eradicate the Hun.