It's better to re-read a good book several times a year, compared to reading a decent book only once or twice. So as you keep rereading books, narrow down your list.

Is it worth it to reread books?

Rereading is necessary to build a greater understanding of a text than can be accomplished on a first reading. Without rereading, it may be impossible to appreciate a writer's more subtle talents or to comprehend a text's intricate ideas and themes.

Why do we reread?

Rereading helps students develop a deeper understanding of what they have read (Roskos and Newman, The Reading Teacher, April 2014). Rereading helps students read with greater fluency, allowing them to give more attention to making sense of what they have read (Pikulski and Chard, The Reading Teacher, March 2005).