Significance of title.

Essentially, the Watchman is a person's conscience. It's first mentioned in this book during a sermon at the Methodist Church where Jean Louise attends with her family. Later, Uncle Jack uses the term to make Jean Louise understand that every man is part of a community and that every man's own Watchman is his own conscience. He goes on to say that Jean has, for too long, rested her own conscience on that of her father, following blindly into any ideal that he followed without applying her own Watchman to find out if she agreed.