Finding himself confronted by the curiously vague and bizarre behaviour of Belinda Pocket, Pip finds out in this chapter the reason why she is so detached from the real world and not at all linked in any meaningful way to reality, as is shown by her tendency to throw out comments that are compltely unrelated to anything else, "in general conversational condescension."
He discovers that Belinda Pocket was the only child of a "accidental deceased Knight" who had managed to convince himself that he should have been made a Baronet were it not for the opposition of some important figure out of personal motives. As a result of this fervent belief, he had instructed that his daughter be brought up as one who should have enjoyed this rank that he feels should have been his:
Be that as it may, he had directed Mrs. Pocket to be brought up from her cradle as one who in the natur eof things must marry a title, and who was to be guarded from the acquisition of plebian domestic knowledge.
So successful was he in this effort that Mrs. Pocket grew up to be "highly ornamental, but perfectly helpless and useless." This of course explains her erratic and bizarre behaviour and the way that she is so detached from the common sphere of reality in the novel.