Answer: People spend time with others who are similar to them.
A central rhetorical principle requiring one's words and subject matter be aptly fit to each other, to the circumstances and occasion (kairos), the audience, and the speaker. Though initially just one of several virtues of style ("aptum"), decorum has become a governing concept for all of rhetoric.
In this book, Dickens shows many christian symbols. As for France, he shows that it is being resurrected and turning into a better place by getting rid of the monarchy. But the sacrifice was all the innocent people's lives that were lost so that France could become greater.