The best answer would be by giving context for Mr. Collins' decision to propose to Elizabeth.
In "Pride and Prejudice," Jane Austen employs a third-person omniscient narration that allows readers to gain insight into characters' thoughts and motivations. This perspective provides context for Mr. Collins' proposal, showcasing Austen's critical view of the institution of marriage during her time. His proposal is motivated by social expectations and financial security rather than genuine affection, highlighting the contrast between practical marriage and the ideal of marrying for love, which is central to Austen's commentary on marriage.