During the first stage a major motif that is occurring a lot is guilt. It seems to me that the entire 1st stage is based off of the fact that Pip feels very guilty for stealing from Joe and he cannot get over it until he moves to London in the Second Stage.
When Pip moves to London to become a gentleman he becomes full of himself and discovers the pale young gentleman's real identity. As Pip becomes a gentleman he also spends more and more money than what he should be spending, this could be foreshadowing something that will happen later on in the story.