Charles Dickens begins Chapter 3 of Great Expectations with a very vivid description of the misty morning and the damp marshes through which Pip must venture to meet the convict. In much of Dickens's writing, details of the setting (the description of the morning, in this case) give readers insight into characters' emotnions. In this case, a very guilty and very scared Pip experiences fear and paranioa that make the task he is about to undertake even more frightening. Of particular importance is Pip's narration, in which he describes the heavy dew that has covered everything in his path. He notes that he is unable to see objects until he is practically on top of them, and the disorientation this creates mirrors the confusion he feels over the situation. He feels that the directional post is directing him to the Hulks for what he has done, and he even imagines that inanimate objects and cattle are all accusing him of being a thief.
Even at such a young age, Pip is aware of the "crime" he has committed; he feels guilty for stealing from his sister and Joe (his sister because of the punishment she would implement if she found out, and Joe because Pip doesn't want to lose Joe's respect), yet he is too afraid for this life to not do as the convict has instructed.
This vividly descriptive scene gives readers insight into Pip's character, and will help readers understand many of the internal conflicts Pip will deal with later in the novel.