This sentence comes from "Zengguang Xianwen", which can be translated as flowing water and falling flowers. Even if it is intentional, the white clouds floating out of the mountains are unintentional. It means that even if you like the other person, the other person may not like you, which expresses a feeling of unrequited love.

Another understanding is that many things in the world are caused by God's will. They are met by chance and coincidence and cannot be changed by human beings. People are advised not to force it, let nature take its course, and gain what they deserve from their life experiences. One's own comfort and calmness embody Taoist thought.

Extended information:

Other famous aphorisms from Zengguang Xianwen (from "Zengguang Xianwen" of the Ming Dynasty):

You know the fish close to the water Nature, I can recognize the sounds of birds near the mountains. Mountains and streams are easy to rise and easy to recede, and easy to turn back and forth in the hearts of small people.

(Translation: If you stay close to the water, you will understand the habits of the fish in the water over time; if you stay close to the mountains and forests, you will understand the habits of the birds in the forest. What is easy to rise and retreat is The streams in the mountains are capricious because of the mentality of villains)

The rivers carry gold and turn into iron, and the iron becomes like gold. Reading must be done with intention, a word is worth a thousand pieces of gold.

(Translation: When you are unlucky, gold can only be worth the price of iron, such as when you encounter inflation during the war; conversely, when luck comes, iron can be as valuable as gold. Reading must be understood carefully. Meaning, you will find that every word has its own price)

When you meet someone, you can’t just say a few words, but you can’t give everything away. Planting flowers intentionally will not bloom, but planting willows unintentionally will create shade.

(Translation: Just talk to people about innocuous things, don’t say everything that’s on your mind. Flowers planted with care often don’t bloom, but willows planted without intention sometimes grow into shades of green. )

It’s difficult to paint the skin of a tiger but the bones, knowing the person but not the heart. Money is like dung, but kindness is worth a thousand pieces of gold.

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The water flowing down the beach is unintentional, and the white clouds coming out of Xiu are unintentional. If we didn't climb high and look at it at that time, who would have believed that the ocean flowing eastward was deep?

(Translation: The water running from the heights to the beach is not what it wants to do, nor is the beach intentionally asking for it. The white clouds drifting over the mountain are not because of the call of the mountain. If you don’t practice it yourself , looking at the river flowing towards the sea from a height, how can I believe that the water going east is as deep as the sea)

Reference: Baidu Encyclopedia - "Zengguang Xianwen"