《太平广记·卷二百零一·才名（好》
又有太师颜真卿在石块上刻上自己的姓名，有的放在高山顶上，有的埋在谷底，并说：怎么知道就没有高山变峡谷、峡谷变高山的时候呢？
又颜太师真卿刻姓名於石，或置之高山之上，或沉之大洲之底，而云，安知不有陵谷之变耶。
There was also Grand Preceptor Yan Zhenqing who engraved his name on stones and put some on mountaintops and others in valleys, saying: How do we know if mountains will not become ravines, and ravines become mountains?