《旧唐书·本纪·卷二十》
自古以来的明君圣帝，苦思劳神，心中不安就像敌人已经进入了护城河，坐等天亮。
自古明王圣帝，焦思劳神，惴若纳隍，坐以待旦，莫不居之则兢畏，去之则逸安。
All the enlightened rulers and saints since ancient times have been racking their brains and working hard, feeling as if they were worried about the enemy who have entered the moat and waiting for the dawn.