《旧唐书·列传·卷二十一》
人臣的偏颇，尚不能识破他的蒙骗，况且君王居高临下，又将使人怎么举手投足呢？
人臣之颇僻，犹莫能申其欺罔，况人君之高下，将何以措其手足乎！
If the bias of a subject is still not easy to discern, how can it be expected that the Sovereign sitting high and above will make any effort?