What are the "three realms" of life in ancient poetry?

The "three realms" of life in ancient poetry are:

The first realm-"last night, the west wind withered the green trees, and I went to the tall building alone to look at the horizon." From Yan Shu's The Recent Flower. ?

The second realm-"I don't regret that my belt is getting wider and thinner for Iraq." The original text is from Liu Yong's Wu Fengqi. ?

The third realm-"the crowd looked for him for thousands of Baidu, and suddenly looked back, but the man was there, and the lights were dim." Originally from Xin Qiji's Jade Case. ?

On the "three realms" of life;

The first realm-"last night, the west wind withered the green trees, and I went to the tall building alone to look at the horizon." From Yan Shu's The Recent Flower. At the beginning of the experience, we were ignorant and hesitant, but we were ambitious and curious about the world.

The second realm-"I don't regret that my belt is getting wider and thinner for Iraq." The original text is from Liu Yong's Wu Fengqi. After we have determined the direction of our life, in pursuit of truth and ideals, we forget to eat and sleep, explore and study day and night, and have no regrets no matter how hard and tired we are. Most of us young people are at this stage.

The third realm-"the crowd looked for him for thousands of Baidu, and suddenly looked back, but the man was there, and the lights were dim." Originally from Xin Qiji's Jade Case. We may get nothing after a long time of hard work, but when we are confused and decadent beyond description, we find that the original success has been unexpectedly realized. You can't find a place to get it, and you don't have to work hard to get it. This is a question of accumulation and success. It is a sudden joy from disappointment to wish realization. This is a very high and rare realm. Many middle-aged and elderly people have gone through many vicissitudes and finally have a clear understanding of life. ?