The message of "A Christmas Carol" is to remind us all that the true spirit of Christmas is about kindness, compassion, and forgiveness. It teaches us that even the most hardened of hearts can be changed with a little bit of love and understanding. Scrooge, the main character, is shown the error of his ways and is transformed into a more generous and giving person. It's a timeless story that encourages us all to spread goodwill and cheer during the holiday season.