《太平广记·卷二十一·神仙二十一》
《易经》上说： 圣人应当按照天地的规律去修养自己的道德，使自己的言行符合自然规律。 
易曰： 圣人者与天地合其德。 是知天不言而信，无为而成。
In the Book of Changes it says: The sage should cultivate his morals according to the laws of heaven and earth, and make his words and actions accord with the natural laws. 