《新唐书·列传·卷一百四十三》
假若克用略知古今之事，能如齐桓公、晋文公时那样，唐朝怎会这么快的灭亡呢？
使克用稍知古今，能如齐桓、晋文，唐遽亡乎哉？
If Ke Yong had a little knowledge of ancient and modern affairs and could be like Duke Huan of Qi and Duke Wen of Jin, how could the Tang Dynasty have perished so quickly?