《旧唐书·列传·卷一百五十》
天下太平的日子太长了，人们不懂战争，听到安禄山叛乱爆发，朝廷一片动荡惧怕。
天下承平日久，人不知战，闻其兵起，朝廷震惊。
The days of peace and tranquility had lasted too long, and the people didn't understand war. When they heard that An Lushan's rebellion had broken out, there was panic and chaos in the imperial court.