The gist and theme are both words that describe the content of a novel, but there are some differences between them. The gist of a novel usually referred to the core value of the novel, which was the main idea or point of view expressed by the novel. It is usually a general and short word used to describe the core content of the novel, emphasizing the theme or idea of the novel. The theme is a broader and deeper term. It not only describes the theme or idea of the novel, but also covers the plot, characters, background and other aspects of the novel. The theme emphasized the novel's worldview, values, philosophy of life, and other aspects. In addition, there were some subtle differences between the main theme and the main topic. For example, the theme is usually the most prominent and important part of the novel, while the theme is the core of the entire novel. In addition, the subject was usually a general description while the subject was a more specific and detailed description. Generally speaking, the main idea and theme are both important words to describe the content of the novel, but there are some differences between them. The specific use depends on the context and context.