《元史·列传·卷三十四》
辽水东西诸郡是金国的腹心，我若得大宁就是卡住他们的脖子，金人只有辽阳，但最终还是保不住的。 
辽水东西诸郡，金之腹心也。我若得大宁以挖其喉襟，则金虽有辽阳，终不能保矣。 
The counties east and west of the Liao River are the heartland of the Jin Dynasty. If I get Daning, I will strangle their necks. The Jurchens only have Liaoyang, but they will not be able to keep it in the end.