《太平广记·卷二十三·神仙二十三》
等到隋炀帝成为晋王，镇守扬州，建起一座玉清玄坛的时候，邀请王远知做坛主，先后派王子相、柳顾言去请他。
及隋炀帝为晋王，镇扬州，起玉清玄坛，邀远知主之，使王子相、柳顾言相次召之。
When Emperor Sui Yang became King of Jin, he guarded Yangzhou and built a Jade Purity Altar. He invited Wang Yuanzhi to be the altar master and sent Prince Xiang and Liu Guyuyan to invite him one after another.