宋高僧傳 6.31

6.31

系曰：「玄公何云袁盎，又為知鉉二人後身耶？」通曰：「人壽百年，自漢至唐，玄幾經出沒乎骸山淚海，斷可知矣。然則玄公多才行道，近古罕聞，法嗣蕃昌，他莫與議也。」

The appraisal says: 'Why did Master Xuan say he was Yuan Ang, and also the later incarnation of Zhixuan—two persons?' The response says: 'A human lifespan is a hundred years; from Han to Tang, who knows how many times Xuan passed through rising and sinking in the mountains of skeletons and oceans of tears? This can certainly be known. However, Master Xuan's manifold talents and practice of the Dao have rarely been heard of in recent antiquity, and his Dharma successors were so flourishing that no one else can compare.'