Where does "The sun rises in the east, its path of great light" come from?

This sentence comes from an essay "Young China" written by Liang Qichao. The original text is as follows:

When the red sun rises, its path is bright. The river flows out and flows into the ocean. The hidden dragon soared into the abyss, its scales and claws flying. The tiger roars in the valley, and all the beasts are frightened. The falcon tests its wings, and the wind and dust spread. The first birth of a strange flower is so beautiful. The cadres have hair and their awns are shining. The sky wears its green color, and the earth wears its yellow color. Even though there are thousands of years, there are eight desolations. The future is like an ocean and the days ahead are long. How beautiful that my young China never grows old like the sky! How great is my Chinese youth, who has no borders with my country!

The scales and claws are dancing and flying; the little tigers are roaring in the valley, all the wild beasts are frightened, the eagles and falcons are flapping their wings, the wind and dust are flying high; the strange flowers have just begun to bud, bright and lush; the sword of the general Freshly ground, shining with light.

With the sky on our head and the earth on our feet, we have a long history when viewed vertically, and a vast territory when viewed horizontally. The future is as broad as the sea and the days ahead are infinite. Beautiful, my young China will live forever with heaven and earth! Magnificent, my Chinese boy, will live forever with the motherland!

Extended information:

Young China is a prose written by Liang Qichao in the late Qing Dynasty. It was written in 1900 after the failure of the Reform Movement of 1898. The article extols the youthful vigor and points out that under feudal rule China is the "eldest empire", and it fervently hopes that a "young China" will emerge to inspire the people's spirit. The article is informal, uses metaphors, and is highly encouraging. It has a strong enterprising spirit and expresses the author's love and expectations for young China.

"Young China" is one of Liang Qichao's masterpieces and a famous article published in "Qing Yi Bao" at that time. This article encourages people to shoulder the important task of building a young China and expresses the desire and enterprising spirit for the prosperity of the motherland. It is recognized as the chapter with the most positive ideological significance and the most passionate emotional color among Liang Qichao's works. The author himself also regards it as his representative work of "creating a new style of writing and stimulating the undercurrent of the people."