《宋史·列传·卷一百三十四》
关陕地区虽有利于进取，但如不在京东地区用兵以牵制分散敌人势力，那么敌人就能集中力量进攻我们。
关陕虽利于进取，然不用师于京东以牵制其势，则彼得一力以拒我。
Although the Guanshan area is advantageous for offensive operations, if troops are not used in the east of the river to contain and disperse the enemy's forces, the enemy will be able to concentrate their forces to attack us.