《资治通鉴·唐纪·唐纪十》
然而隋炀帝威风八面一统天下，颉利跨有北部广大地区，统叶护占据西域一带，如今它们都已灭亡，这是朕与大家亲眼得见，希望你们不要因为一时强盛而自满起来。 
然隋炀帝威加夷、夏，颉利跨有北荒，统叶护雄据西域，今皆覆亡，此乃朕与公等所亲见，勿矜强盛以自满也！ 
However, Emperor Yang of Sui was powerful and unified the world, Qieli ruled over the vast northern regions, and the Tongyehu occupied the Western Regions. Today, they have all been destroyed, and this is something that We ourselves have witnessed. I hope that you will not become complacent because of our temporary prosperity.