《资治通鉴·唐纪·唐纪十一》
魏徵答道： 威德加于四方，则远超过贞观初年；人心悦服则不如从前。 
对曰： 威德所加，比贞观之初则远矣；人悦服则不逮也。 
Wei Zheng replied, "Your mighty virtue has spread to all directions, which has far exceeded the early years of Zhenguan. However, people's loyalty and obedience are not as good as before."