《太平广记·卷四百二十四·龙七》
认识龙的人说： 龙作为一种灵瑞，是为了行云布雨而到天上去的。现在却出现在卤水里，怎么能云行雨施呢？ 
识者曰： 龙之为灵瑞也，负图以升天，今乃见于卤中，岂能云行雨施乎？ 
Someone who knew the dragon said: As a divine beast, the dragon went to heaven to form clouds and rain. Now it has appeared in brine. How can it form clouds and rain?