Answer:
A frequent subject of a literary work is good vs evil.
Step-by-step explanation:
Good and evil and their contradictions, confrontations and the implications that these concepts bring about people are a recurring theme in literature, in all its genres and styles.
For example, in fiction literature such as The Strange Case of Dr Jekill and Mr Hyde, where the character suffers a dual personality condition, with a normal existence and an evil and cynical hidden personality; or in the classic detective novels, with a good cop who wants justice, and an unscrupulous and bloody criminal.
Throughout the history of literature, this theme has been recurring. This is so because it implies human nature itself, where the duality of personalities and the implications of people's own actions necessarily imply a positive and negative assessment of events and situations.