Final answer:
An author might use irony in a text primarily to teach a lesson or communicate a theme, as this literary device effectively highlights contradictions and complexities, engaging readers on a deeper level.
Step-by-step explanation:
The usage of irony in a text can serve multiple purposes, but one key reason an author might employ this literary device is to teach a lesson or communicate a theme. Irony can subtly highlight the contradictions and complexities inherent in human nature and society. It often allows readers to engage with the text on a deeper level, seeing beyond the surface actions to the underlying message or commentary about life, culture, or human behavior. For instance, through the use of dramatic irony where the audience knows something the characters do not, an author can create tension while also emphasizing the theme of a story.
Authors like Jonathan Swift and Charles Dickens often used irony and satire to critique social institutions or mores, thereby communicating their themes more effectively. While humor and irony can sometimes obscure the thematic message, when used skillfully, they can significantly enhance the reader's understanding of the complex messages the author intends to convey.