元代诗人刘立雪,借助山岩遮月的景色(有学者考证,月岩在湖南道县。明代地理学家徐霞客曾写入《楚游日记》),阐述世事盈亏、损益之间的辩证关系。一般的咏物诗,都是先写景物,然后即物明理。此诗别开生面,先讲一番道理,说世间的事物向来都是逢满即亏、物极必反的;因此,哲人主张“不到顶点”。之所以十分不如八分,就是因为八分尚有发展余地,而十分到了顶点,立刻就走下坡路了。诗人觉得,光这么议论说服力还不够强,又举出眼前的自然现象来作为佐证, Liu Li-xue, the poet of the Yuan Dynasty, elaborated on the dialectical relationship between world profit and loss and profit and loss with the help of the scenery of the shale covered rocks (some scholars have done a research on the moon rock in Daoxian County, Hunan Province and Xu Xiake, a geographer of the Ming Dynasty, wrote “Diary of Chu Travels”). Ordinary chant poetry, are the first to write the scenery, and then that things clear. This poem does not come out of the past, let’s make some truths, that things in the world have always been full, that is, losses, and things must be reversed; therefore, philosophers claim “not to the top ”. The reason is very much worse than the Eighth, because there is still room for development Eighth, and is very culminating, and immediately on the downhill. The poet believes that the argument of light is not strong enough to persuade him, and cites the immediate natural phenomenon as evidence.