I just caught this discussion as I re-read today. Elizabeth debates with Bingley and Darcy whether or not it is weakness of character or an amiable disposition that would have a person (Bingley) change course at the advice of a friend (Darcy). Darcy basically says it is impossible to know without understanding the "degree of importance of the request" or the "degree of intimacy" between the parties. Hmmm, knowing the influence that Darcy wields (later) over Bingley... is Bingley a weak character too easily influenced? Or, is he an amiable soul trusting the advice of an intimate friend?