Love is separated by mountains and seas. Where do mountains and seas come from?

Shallow joy is like a pale dog, deep love is like a long wind, and love is across the mountains and seas. May the mountains and seas be flat, which means shallow love for a person, like white clouds in the sky, may disappear at any time. Have a deep love for a person, just like the gentle wind, accompanying him in obscurity anytime and anywhere. I am separated from the person I love by overlapping mountains and deep seas. Although the mountain can't disappear and the sea can't fill it, I will still silently guard her like Changfeng.

From the Song Dynasty poet Wang Zhongwei's Canggou Changfeng.

Clouds are tangible, but they will dissipate at any time. Changfeng is invisible, but it will never disappear. It's like loving someone deeply, without romantic love words, but with sincere companionship and affection. Love cannot be seen with the eyes. If you want to know whether he is your "pale dog" or "Changfeng", please remember to feel it with your heart.

If you're around? It's fine weather anyway. All the confessions of long-term love? All vows of eternal love? , all sweet words? , are not as great as * * * with life? .