Analyse the provided extract from Pride and Prejudice, discussing ways in which the narrative voice and dialogue are used.

BEGINNING OF EXTRACT: ``And so ended his affection,'' said Elizabeth impatiently. ``There has been many a one, I fancy, overcome in the same way. I wonder who first discovered the efficacy of poetry in driving away love!''
``I have been used to consider poetry as the food of love,'' said Darcy.
``Of a fine, stout, healthy love it may. Every thing nourishes what is strong already. But if it be only a slight, thin sort of inclination, I am convinced that one good sonnet will starve it entirely away.''
Darcy only smiled, and the general pause which ensued made Elizabeth tremble lest her mothe…