This chapter in Great Expectations is a pivotal one to the theme of Appearances vs. Reality. For, after Magwitch appears at the residence of Pip and Herbert and explains his history, Pip realizes that he has been disillusioned all along about the identity of his benefactor. With this new knowledge, he goes to Mr. Jaggers.
First of all, Jaggers is very wary when Pip appears and cautions him,
Don't commit yourself' said Mr. Jaggers, 'and don't commit anyone. You understand--anyone.
When Pip says that he has been informed by a person named Abel Magwitch that "he is the benefactor so long unknown to me," Mr. Jaggers makes only the comment, "That is the man...--in New South Wales." He does not acknowledge to Pip, however, that he is aware that Provis/Magwitch is in London because, by law, he would have to report Magwitch: "Don't commit yourself."
Mr. Jaggers, instead, declares,
I communicated to Magwitch in--New South Wales--when he first wrote to me--from New South Wales--the cation that he was not at all likely to obtain a pardon, that he was pexpatriated for the term of his natural life, and that his presenting himself in this country would be an act of felony, rendering him liable to the extreme penalty of the law.
So, while Jaggers confirms for Pip that Magwitch is the true benefactor, he entertains no more conversation about Magwitch. Jaggers also gives Pip no consolation for his disappointment and disillusionment:
Not a particle of evidence, Pip...ake nothing on its looks; take everything on evidence. There's no better rule.