Tell me the moral you understand.

This is an old proverb of China, which means that all the stars in the sky surround Polaris, and all the water in the world flows eastward.

The running laws of nature and human society are fixed, just like the stars running around Polaris and the water flowing downwards. People should respect and abide by these laws instead of trying to change them. This is also the embodiment of China's ancient philosophy of "harmony between man and nature".

In addition, this sentence also implies the passage of time and the evolution of history. The water from the east will always flow to the west, which means that the passage of time and the evolution of history are one-way and irreversible. People should learn from the long river of history, cherish time and grasp the present.

In short, this sentence reminds people to respect the laws of nature, cherish time and grasp the present.