《新唐书·列传·卷五十七》
现魏征随时劝谏，多数说中了我的过失，就像镜子照脸，好坏都看出来了。 
今魏徵随事谏正，多中朕失，如明鉴照形，美恶毕见。 
Now Wei Zheng always advised and admonished me, and most of his words pointed out my faults, just like a mirror reflects the face, showing both the good and the bad.