《汉书·纪·元帝纪》
由是就疏太子而爱淮阳。宣帝说： 淮阳王明于察断而爱学法律，应继承我的事业。 
由是疏太子而爱淮阳王，曰： 淮阳王明察好法，宜为吾子。 
Since then, he distanced himself from the crown prince and favored Huaiyang. Emperor Xuan said:  Huaiyang Wang is good at making judgments and loves studying law. He should succeed me.