This is called the theme.
The unifying subject or idea of a literary work is called the theme. It is the central message or insight that the author conveys to the reader through the text. Themes are often universal concepts that explore human experiences, emotions, and beliefs.
The topic of a literary work refers to the main subject or theme that the work explores. It is the overarching idea or concept that the author is trying to convey through their writing. Examples of literary work topics include love, betrayal, war, identity, and redemption.
the main idea or main thought about which the work is written
motif is a recurring theme, idea or subject often in literary works or music
Thesis statement
The central message of a literary work is the main theme or idea that the author conveys to the reader. It is the underlying meaning or lesson that the work as a whole aims to communicate. The central message often reflects the author's views on a particular subject or issue and is usually open to interpretation by the reader.
The term you are looking for is "theme." Theme refers to the underlying message or main idea that the author is trying to convey through a literary work.
Please provide the name of the main character in the literary work that you would like information about.
The main character of a literary work is called the protagonist.
The theme
In a nonfiction work, a writer's main idea is his or her purpose for writing.
The main idea is likely to appear in the first portion of a longer work. For shorter works, the main idea is generally in the first paragraph.