Where does "The vast white land is so clean" come from?

"It's like a bird that has eaten all its food and throws itself into the forest, leaving a vast expanse of white. The earth is really clean." See Qing Dynasty? Chapter 5 of "Dream of Red Mansions" by Cao Xueqin.

The general idea of ??these two sentences is: It is as if the food has been eaten, the birds have scattered into the forest, leaving only a vast white land, clean and nothing.

The general idea of ??these two sentences is: It is as if the food has been eaten, the birds have scattered into the forest, leaving only a vast white land, clean and nothing.

These are the last two lines of the last of the twelve songs of "Dream of Red Mansions", "The End? Every Bird Casts Its Way into the Woods," sung by the Fairy Alarm for Jia Baoyu when he was sleepwalking in the illusory realm of Taixu. This song is a metaphor for family failure. They all went their separate ways, always writing about the unfortunate ending of Jia Baoyu, the Twelve Hairpins of Jinling, etc., and the final decline of Jia's family as "the tree fell and the monkeys dispersed".

After the Jia Mansion was "defeated and confiscated", its "descendants were scattered" and "completely defeated". Jia Baoyu "abandoned and became a monk" and rebelled against the feudal family. The 120th chapter of "A Dream of Red Mansions" tells that Jia Zheng helped Jia Mu's coffin to Jinling. On the way back, it snowed heavily. He met Baoyu who became a monk and said goodbye to him. Then he drifted away with a monk. Jia Zheng hurriedly chased after him, but he suddenly disappeared. "I saw only a vast white wilderness with no one in sight." This ending is completely consistent with what ? wrote. Nowadays, these two sentences are often borrowed to describe some things in decline, which gradually decline from prosperity to decline, and finally reach the ending of "the tree falls and the hozens scatter", and everything is in vain.