《隋书·帝纪·卷四》
凡王宫中派使者来，无论贵贱，炀帝都委曲己意摆出一副奉承的脸色，再三赠以厚礼。
中使至第，无贵贱，皆曲承颜色，申以厚礼。
Whenever messengers were sent from Wanggong, regardless of their status or status, Yang Guang would condescend to show a flattering face and repeatedly give them generous gifts.