It seems you've repeated several statements about themes in literature. To clarify, a theme is not typically stated word-for-word by the author, nor is it merely a concise description of plot events. Instead, a theme represents the underlying message or central idea of a work, often conveyed implicitly through characters’ actions, interactions, and the overall narrative.
Themes can be crucial throughout a story, as they often influence character development and drive the plot forward. While themes may be more prominent at certain points in a narrative, they generally remain significant from beginning to end, enriching our understanding of the text.
If you have specific questions about themes in a particular work or need further elaboration, feel free to ask!