《韩非子·难三》
管仲说： 屋里讲话，声音满屋；堂上讲话，声音满堂。此人即可称为天下之主。 
管子曰： 言于室，满于室；言于堂，满于堂：是谓天下王。 
Guan Zhong said: Speaking in the room, the voice is full of the room; speaking in the hall, the voice is full of the hall. This person can be called the Lord of the World.