《资治通鉴·唐纪·唐纪九》
国家分为几部分则力量削弱，容易控制，几部分势均力敌则难以相互吞并，各自力图保全，必不能与大唐相抗衡。
国分则弱而易制，势敌则难相吞灭，各自保全，必不能抗衡中国。
"When a country is divided into several parts, its power is weakened and easier to control. If the several parts are evenly matched, they will not be able to annex each other. They will all try to protect themselves and cannot compete with the Great Tang Dynasty."