《淮南子·道应训》
第二天，薛公打听到被赐予最好的玉珥的妃嫔是谁，便认定这位获得最好玉珥的妃嫔就是威王最宠爱的，于是就劝威王立这位妃嫔为王后，而这也正合威王之意，威王十分高兴，从此就更加看重薛公了。
旦日，因问美珥之所在，因劝立以为王后。齐王大说，遂尊重薛公。
The second day, Xue Gong found out which concubine was bestowed the best jade earring, and thus determined that this concubine who obtained the best jade earring is the one who is most favored by King Wei. Therefore, he persuaded King Wei to establish this concubine as the queen, which coincided with King Wei's intentions. King Wei was very happy, and began valuing Xue Gong even more.