Sydney Carton and Charles Darney were alike in some ways but completely different in other ways. Some of their characteristics were similar while others were unlike. Carton was an attorney's assistant who lived in Paris and Darney was a teacher who lived in London. They both had intangibles about them that you just couldn't put your finger on. These similarities and differences helped develop the theme.
Even though there were some similarities between Sydney and Charles there were not that many. The few there were in the book helped Build symmetry. These two people both had a love for Lucie though carton had a hard time expressing it. These two people had a stunning resemblance in their physical features. This helped acquit Darney the first time as carton pointed out their resemblance and said no one could tell them apart. This also helped at the end of the story. These two people are both very smart, even though they don't know it at times. They come up with brilliant ideas between them. These two people may look similar and have a few similar qualities they have many more differences.
The differences between Carton and Darney were overwhelming. While Carton was a disheveled, insolent, indifferent and rude man, Darney was a handsome, gentle successful, responsible human being. When carton sees Darney he realizes what he could have done with his life. Carton realizes he is not good enough for lucie. Darney is rather flat and predictable, while Carton is exciting throughout the book. Though Carton is less likeable, he is witty, entertaining and has many levels. In the end, while Darney stays a very respectable person, Carton digs himself out of dismal, indifferent existence to become the hero of this novel. These differences between Charles and Sydney supported his themes of resurrection and revolution.
The way Dickens's used symmetry to develop was interesting. He showed that two things can be similar, but never exactly alike.