"Scrooge! a squeezing, wrenching, grasping, scraping, clutching, covetous, old sinner!"
This quote shows how horrible of a person Scrooge once was and how he was a terrible sinner. However, since he eventually changed into a kinder person, this proves that anyone has the ability to change.
In this portion of the story, Scrooge is taken by the ghost of Christmas past to his town where he grew up. Once arriving, he becomes happy, a feeling that he had not felt yet in the story. This shows that Scrooge is changing and becoming happier.
“Good Heaven!” said Scrooge, clasping his hands together, as he looked about him. “I was bred in this place. I was a boy here.”
When Scrooge realizes that Tiny Tim will die, The ghost of Christmas present repeats what Scrooge had said earlier in the story, which was that Tim should die and decrease the surplus population. At these words, Scrooge begins to regret his meanness and change into a better person.
"Scrooge hung his head to hear his own words quoted by the Spirit, and was overcome with penitence and grief."
When the ghost of Christmas yet to come brings Scrooge to his gravestone, Scrooge realizes that he is going to die the next day. To change the future, he promises to live in the past, present, and future, as well as keeping Christmas in his heart year round. Scrooge promising to do these things is completely different from Scrooge at the beginning, showing how even a stingy old man can change into a kind one.
"I will honor Christmas in my heart, and try to keep it all the year. I will live in the Past, the Present, and the Future. The Spirits of all Three shall strive within me. I will not shut out the lessons that they teach."
In conclusion, the theme of anyone can change is developed through Scrooge being a harsh old man at the start of the story, and in the end being a loved, well - respected man.