The opening sentence of the book, ""It was the best of times, it was the worst of times...," is parallelism, which is a series of words, phrases, etc that are contrasted or put together in a...
They represent the two conflicting influences of the world: the entrenched conservatism of the British Empire (London) and the changing cultures and societies of contemporary France (Paris).
Dr. Manette promises not to interfere with Lucie and Charles Darnay's relationship. Darnay promises not to tell Dr. Manette his true identity until the morning of the wedding.