Important themes in A Tale of Two Cities

• the possibility of resurrection, shown with Carton's change in his outlook on life at the end of the book, and the "resurrection man" digging up the corpses of others for science experiments.
• the need for sacrifice- shown with Carton's willingness to go die in the place of Darnay, and in the Defarges' need for any Evremonde to be held accountable and punished for their family crimes. 
• the use of violence and oppression in the revolutionaries- throughout the novel the revolutionaries fight their oppressors and killed them in a public fashion