In chapter 40, how does Pip's discussion with Jaggers disabuse him of the notion that Miss Havisham has been his patron? (Great...

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,

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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,

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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:

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Not a particle of evidence, Pip...ake nothing on
its looks; take everything on evidence.  There's no better
rule.