元代《诗经》学者刘玉汝在其《诗缵绪》中用不少笔墨探讨“天道”和“孝道”问题,这值得思考。如《十月之交》篇:诗言灾异,此篇最详。《七月》尽天道之常,《十月之交》尽天道之变,所谓“天道”备于上二诗,尤可观,有国所当鉴。刘玉汝认为《诗经》中《七月》和《十月之交》都涉及“天道”讨论,一个为天道之常,一个为天道之变。但是何为常?何为变?何为天道?刘玉汝却没有给出详尽答案。“天”在先秦儒家思想中的含义极其复杂, It is worth considering that Liu Yuru, a scholar of the Book of Songs in the Yuan Dynasty, used a lot of ink in his “Poems and Threads” to probe into the issue of “Heaven” and “Filial Piety.” Such as “the turn of October” articles: poetry disaster, the most detailed article. “July” do all too often, “at the turn of October” make the best of the change, the so-called “Heaven” prepared in the second poem, you can view, there are countries as Kam. Liu Yuru believes that the “July” and “the turn of October” in The Book of Songs all involve the discussion of “Heavenly Tide”, one of which is the common of Heaven and the other of Heaven. But what is regular? What is change? What is Heaven? Liu Yu Ru did not give detailed answers. The meaning of “day” in pre-Qin Confucianism is extremely complicated,