《太平广记·卷二百四十七·诙谐三》
我请问大德法师，天上没有两个太阳，朝中没有两个皇上。现在，皇上一个人，驾御统治普天下。
弟子问天无二日，上无二王。
I would like to ask Master Da De, there are no two suns in the sky, and there are no two emperors in the imperial court. Now, the emperor alone governs the world.