But ambition is a dirty word when it’s used by women; it’s decidedly unladylike, in fact.”
-- Agatha (Chapter 47)

Importance: In the manuscript, Agatha omits certain details regarding her character. She is forced to portray herself in a favorable light, as women tend to be treated more harshly in the public spotlight than men. In saying this, Agatha intimates to Archie that writing is more than just a hobby to her, or a means of securing financial independence. Rather, it is something she is wildly passionate about. The writing world is one she wishes to succeed in, and she is now willing to do anything to achieve her dreams.

You killed the innocent woman I once was—the one who believed she had a contented marriage and pleasant family life, the one who molded her entire existence around you and your happiness—just as surely as if you committed murder.
-- Agatha (Chapter 46)

Importance: At last...