Pip changes quite a lot in the story. So far, he has gone from being a scared little boy to a self-conscious young adult. He has Estella to blame for self-consciousness. She has made his life torture, and has every appearence of being ready to carry on in this manner for quite some time. A life as a blacksmith would suit him, were he to go back to it, and Biddy would make a good wife. Pip's Expectations and his ambition to marry Estella are his downfall. This is quite ironic, considering that Estella was introduced to him at Satis House, the house of satisfaction. The chain which he started on his first day at Satis House is made of false gold. To him, it is a beautiful thing which nothing else can match. To those more perceptive than him, it is simply dragging him down. This applies to the real world. It is like the old saying that sometimes the wanting of something is better than the having. Things in general are not what we expect them to be.
Another event which sheds insight on the world is Pip's first encounter with the convict. Twain puts a lot of emphasis on the fact that Pip would do anything at all, were he afraid enough. This is true of all of us. Things scare us--war, death, and so on. Other things scare us too, such as fatness and unattractiveness. It is the fears in the second category that are commented on by Twain. The work of a successful advertizing agency on us is similar to the work of the convict on Pip, in that it gets us to do exactly what they want. A backlash against this, though, is not productive, as it simply adds yet another fear to the list--the fear of being afraid. Pip does not have to deal with this, as he is simply scared out of his wits by a convict who is good at making up stories which are convincing to young children. This incident has an impact on Pip's life, too. Throughout the story so far, Pip lives in terror of his convict.