The last sentence is an affectionate review of China's military-civilian revolutionary struggle. The people of China have made great efforts and sacrifices to pursue the right path, which makes "the sun and the moon change into a new sky", and the sky is old if it is affectionate. At the same time, it includes the development of nature and human society, both of which exist objectively. The collapse of the Kuomintang and the victory of the China Revolution are historical inevitability.
The phrase "If the sky is sentient, it will be old" comes from the poem "The Fairy Song of Jin Ping Mei" written by Li He, a great poet in the Tang Dynasty. This poem has been often quoted by later generations since Li He, and borrowed by famous poets such as Ouyang Xiu, a great poet in the Song Dynasty, and Yuan Haowen, a great poet in the Yuan Dynasty.