佛祖歷代通載 6.127

6.127

（二十九）　許詢字玄度。高陽人。魏中領軍允曾孫也。澡心學佛。甚為江左諸公卿仰慕。簡文帝高其風。每月白風恬。思清言妙理必造焉。至其亹亹。簡文不覺前席。達旦忘倦。帝謂親友曰。玄度才情故未易有。劉真長為時譚宗。而與結清言友。每謂人曰。吾不見玄度幾為輕薄令尹。又甞曰。清風明月何甞不思玄度。

(29) Xu Xun, courtesy name Xuandu, was a man of Gaoyang. He was the great-grandson of Yun, Army Commander of the Center under the Wei. Cleansing his mind, he studied Buddhism, and was greatly admired by all the high ministers and nobility east of the Yangtze. Emperor Jianwen esteemed his lofty air; whenever the moon was bright and the wind calm, longing for pure conversation and subtle principles, he would unfailingly visit him. As their dialogue flowed ceaselessly, Jianwen would unconsciously lean forward on his mat, forgetting fatigue until dawn. The Emperor said to his close companions, "Talent and sentiment like Xuandu's are truly not easy to find!" Liu Zhenchang was the foremost conversationalist of the era, yet he forged a friendship in pure conversation with him, often telling people, "Had I not met Xuandu, I would almost have become a superficial magistrate." He also once remarked, "When the wind is fresh and the moon is bright, how could I ever fail to think of Xuandu?"