You might as well read Wang Guowei's "Human Ci"
[1] The realm of Ci is the highest. If you have a state of mind, you will have your own high standards and famous sentences. This is why the poetry of the Five Dynasties and the Northern Song Dynasty is unique.
[2] There is the creation of a scene, and there is a description of the scene. This is the reason why the two schools of "ideal" and "realism" are divided. However, it is difficult to distinguish between the two, because the environment created by a great poet must be in line with nature, and the environment he writes must be close to the ideal.
[3] There is a realm of me, and there is a realm of not-me... In the realm of me, when observing things with me, all old things have my color. In the state of selflessness, one observes things in terms of things, so one does not know who is me and what is a thing. There are many ancient poets who write about my state of mind. However, it is impossible to write about the state of selflessness before the beginning. Here, the heroic people can establish their own ears.
[6] The state is not just a scenery, joy, anger, sorrow, and joy are also a state in the human heart. Therefore, those who can depict real scenery and true feelings are said to have a state of mind. Otherwise, it is said to have no realm.