It comes from "Cang Dog Changfeng" by Wang Zhongwei, a poet in the Song Dynasty.
Original text: Light joy is like a gray dog, deep love is like the long wind. My love is separated by mountains and seas, and I hope the mountains and seas can be leveled.
Translation:
A superficial liking for someone is like the white clouds in the sky, which may disappear at any time. Deep love for someone is like the gentle wind, silently accompanying them anytime and anywhere, and never leaving. Although there are mountains and deep seas between me and the one I love, even though the mountains cannot be removed and the sea cannot be filled, I will still guard her silently like the long wind.
Extended information:
"Slight happiness is like a gray dog, deep love is like the long wind." The floating clouds are tangible, but they will dissipate at any time. It's like you can say your love casually. , but these love words may not be sincere. Although the wind is invisible, it never disappears. It is like loving someone deeply. There are no fancy romantic words, but there is sincere companionship and affection. Deep love cannot be seen with your eyes, please remember to feel it with your heart.
The meanings of the two images of Baiyun and Canggou: "Canggou" means "Baiyun", and "Baiyun" means "Canggou". "Baiyun" is the modern way of expressing clouds; "Canggou" is the ancient people's name for clouds. The idiom "baiyun canggou" uses the unpredictability of white clouds to refer to the vagaries of the world.
Reference materials: Baidu Encyclopedia-Cang Gou
Baidu Encyclopedia-Changfeng
Baidu Encyclopedia-Baiyuncang Gou