《资治通鉴·后周纪·后周纪二》
有人认为自从大唐皇室灭亡，群雄武力相争，一位帝王的兴盛衰亡，长的十几年，短的三四年，虽然有忠臣智士，又能怎么样呢！
或以为自唐室之亡，群雄力争，帝王兴废，远者十馀年，近者四三年，虽有忠智，将若之何！
Some people believe that ever since the Tang dynasty was overthrown, warlords have been fighting each other. The rise and fall of an emperor lasted for a dozen years at the longest or three or four years at the shortest. Even if there were loyal ministers and wise men, what could they do?