《资治通鉴·隋纪·隋纪八》
裴寂说： 屈突通拥有大批军队，凭借着坚固的城池，我们若舍弃他而去，要是进攻长安而不能攻克，后退就会遇到河东方面的追击，腹背受敌，这是危险的策略。
裴寂曰： 屈突通拥大众，凭坚城，吾舍之而去，若进攻长安不克，退为河东所踵，腹背受敌，此危道也。
Pei Ji said: "Qu Tutong has a large army and is protected by a fortified city. If we abandon him and attack Chang'an but are incapable of capturing it, we will be pursued from behind by Hedong forces and attacked from both the front and back; this is a dangerous strategy.