《资治通鉴·唐纪·唐纪六十三》
当时，唐朝和吐蕃签订长庆盟约不久，就接纳吐蕃维州守将的归降。从国家的利益来说，夺取维州的事小，而遵守盟约的信义为大；从吐蕃对国家危害的程度来说，也是维州稍缓而关中最为紧迫。
是时唐新与吐蕃修好而纳其维州，以利言之，则维州大而信大；以害言之，则维州缓而关中急。
At that time, not long after the Tang Dynasty had signed the Changqing Convention with Tubo, they accepted the surrender of the governor of Weizhou of Tubo. From the perspective of state interests, the matter of taking Weizhou was small, but the issue of upholding the integrity of the convention was great; From the perspective of the degree to which Tubo threatened the state, Weizhou was less pressing, while Guanzhong was most urgent.