The Ghost of Christmas Past showed Scrooge how his life could have been different if he had made different choices. The ghost took him back to his childhood, where he saw the joy and love he had with his family. Scrooge also saw how his greed and selfishness had caused him to miss out on many important moments in life. The ghost showed him the consequences of his actions, and how they had led to his present situation. Scrooge realized that he could change his life and have a different future if he changed his ways.