While he often mentioned and praised specific works by other authors, he never explicitly stated which book was his absolute favorite.
We can however look at some clues:
* His own works: Dickens was incredibly proud of his own writing, particularly *A Tale of Two Cities* and *Great Expectations*. It's highly likely he cherished these.
* Shakespeare: Dickens was a huge fan of Shakespeare and often quoted him. He likely held *Hamlet* or *King Lear* in high regard.
* Classics: Dickens was a scholar of literature and appreciated the works of authors like Cervantes, Fielding, and Scott.
Ultimately, we can only speculate on what Dickens's favorite book might have been.
It's more likely that he enjoyed many books for different reasons and that his personal preference may have changed over time.