《资治通鉴·唐纪·唐纪八》
现在陛下即位没多久，却已经多次失信了！ 太宗惊愕地问道： 朕怎么失信了？ 
今即位未几，失信者数矣！ 上愕然曰： 朕何为失信？ 
His Majesty has not been on the throne for long, yet he has already broken his promise many times! Taizong was shocked and asked, How have I broken my promise? 