People and affairs have their own metabolism, and the exchanges become the past and the present.

Things in the world are constantly changing, and one generation after another will pass forever.

He who knows others is wise, and he who knows himself is wise.

Those who understand others are wise, and those who understand themselves are wise

Water has a source, and its flow has been endless since ancient times; trees have roots, and its growth has been endless.

Because water has a source, its flow is endless; because trees have roots, their growth is endless.

If you want to conquer the three thousand realms of the earth, you must go to the peak of eight hundred mountains.

Standing higher means seeing farther.

The Three Thousand Realms comes from Buddhism. Buddhism believes that Mount Sumeru, the sun and the moon, and the four continents are one world. A thousand worlds are accumulated into a small thousand worlds. A thousand small thousand worlds are accumulated into one medium thousand worlds. Accumulate a thousand medium thousand worlds into a large thousand worlds. One World\Thousand Worlds in the Thousand Worlds and the Great Thousand Worlds are collectively called the Three Thousand Great Thousand Worlds.

This poem is a metaphor.

I don’t know where the eight hundred plates come from, but it is just a metaphor.

The sparrows don’t know how high the heaven and the earth are, and the wells don’t know the vastness of the rivers and seas.

“The sparrow does not know the height of the heaven and the earth, and the well does not know the vastness of the river and the sea.” From Huan Kuan’s "Salt and Iron Theory". The original text is: "Inside the building, the sparrows don't know the height of the sky and the earth; the frogs in the well don't know the size of the rivers and seas; the poor men who are not wives don't know the concerns of the country; the merchants who carry loads don't know the wealth of Yidun..."

The flying sparrows are no higher than the eaves. They don’t know how high the sky is and how big the earth is. The well is so big that it is only a few feet wide. It cannot imagine how wide the river and the sea are. It is a metaphor that a mediocre person with a narrow vision cannot understand the broad mind of an ambitious person.

The comparison between the sparrow and the well shows that you cannot understand the world without broadening your horizons. It tells us that people should not limit themselves to a narrow life circle, but must have extensive contact with society in order to be knowledgeable and knowledgeable.

A sage will surely lose something if he worries a lot; a fool will gain something if he worries a lot.

Even if you are a saint, no matter how carefully you think about things, you will still be negligent. No matter how stupid you are, as long as you think carefully and use your brain more, you will gain something.