《论衡·卷十五·变动篇》
所以天将要下雨，蝼蛄蚂蚁就会搬家，蚯蚓就会爬出泥土外，琴弦就会松弛，旧病就会复发，这就是万物受天的影响的应验。
故天且雨，蝼蚁徙，丘蚓出，琴弦缓，固疾发，此物为天所动之验也。
So when the sky is about to rain, the mole ants will move, the earthworms will crawl out of the soil, the strings of the piano will loosen, and the old illness will relapse, which is the fulfillment of the influence of heaven on all things.