If you haven't read "A Christmas Carol", you probably have seen one of its many many television and movie adaptations ranging from real people to Disney and the Muppets, the plot has also been used in many many series or as a basis to new stories. I love this story. It teaches you how you can change to become a better person even if you have a bad start. It teaches you that it is okay to enjoy something from time to time even if you need to work hard for the rest of the year. And that you should always have compassion for the less fortunate. Certainly, this book totally deserves its place among the greatest ever written. So many positive messages in it.
My favourite book by Charles Dickens so far: "Great Expectations. I also read "A Tale of Two Cities" and a few more, see here.