* The encounter with Magwitch sparks Pip's fascination with the outside world. He is initially terrified of Magwitch but is also captivated by his stories and the mystery surrounding him. This encounter awakens a desire in Pip to escape his humble upbringing and become someone of importance.
* Magwitch's request for food and a file sets in motion Pip's first act of kindness. Though terrified, Pip provides Magwitch with what he needs, an act that will have significant consequences later.
* The arrival of Miss Havisham and Estella at Satis House introduces Pip to the world of wealth and social status. This introduction fuels Pip's ambition and desire for a better life. He becomes infatuated with Estella, who represents the unattainable life he craves.
* Pip's secret involvement with Magwitch becomes a source of shame and guilt. This secret, along with the ongoing mystery of Magwitch's identity, becomes a significant source of tension and conflict in the novel.
In short, the arrival of Magwitch, even though seemingly insignificant at first, acts as the catalyst for Pip's entire journey. It sets in motion his dreams of wealth, his desire for social climbing, and ultimately, the complex web of relationships and secrets that define the story.