Final answer:
Darcy attributes his personal growth to the positive influence of Elizabeth, indicating that through his interactions with her, he has learned humility despite his proud and selfish upbringing.
Step-by-step explanation:
As they walk together, Darcy blames his upbringing for his selfishness and pride, however, he claims Elizabeth's influence has "properly humbled" him. Throughout the narrative, there are various instances of characters expressing remorse or reflecting on their personal growth. These moments signal a transition in their development, showing how experiences and interactions with others can have a profound impact on their character and behavior.