In the film and theatrical versions of A Christmas Carol, you can get the sense that the ghosts are doing all the work in changing Scrooge’s grim attitude. In the book, however, you can see the full range of his thoughts and how they’re changing as he encounters the three spirits. What was interesting to me was that almost from the beginning, once aware of his low temperature, Scrooge had the mindset and willingness to change. He didn’t fight it. He said multiple times that he would heed the lessons of the ghosts and try to soak up every word of advice.