Which group of words does the author use to advance the plot through the characters?

From Sense and Sensibility, Chapter IV by Jane Austen:

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"What a pity it is, Elinor," said Marianne, "that Edward should have no taste for drawing."

"No taste for drawing," replied Elinor. "Why should you think so? He does not draw himself, indeed, but he has great pleasure in seeing the performances of other people, and I assure you he is by no means deficient in natural taste, though he has not had opportunities of improving it. Had he ever been in the way of learning, I think he would have drawn very well. He distrusts his own judgment in such matters so much that he is always unwilling to give his opinion on any picture, but he has an innate propriety and simplicity of taste, which in general direct him perfectly right."

Marianne was afraid of offending and said no more on the subject, but the kind of approbation which Elinor described as excited in him by the drawings of other people was very far from that rapturous delight which, in her opinion, could alone be called taste. Yet, though smiling within herself at the mistake, she honoured her sister for that blind partiality to Edward which produced it.

"I hope, Marianne," continued Elinor, "you do not consider him as deficient in general taste. Indeed, I think I may say that you cannot, for your behavior to him is perfectly cordial, and if that were your opinion, I am sure you could never be civil to him."

Marianne hardly knew what to say. She would not wound the feelings of her sister on any account, and yet to say what she did not believe was impossible. At length, she replied:

"Do not be offended, Elinor, if my praise of him is not in everything equal to your sense of his merits. I have not had so many opportunities of estimating the minuter propensities of his mind, his inclinations, and tastes, as you have, but I have the highest opinion in the world of his goodness and sense. I think him everything that is worthy and amiable."

"I am sure," replied Elinor with a smile, "that his dearest friends could not be dissatisfied with such commendation as that, and I do not perceive how you could express yourself more warmly." Marianne was rejoiced to find her sister so easily pleased.

"Of his sense and his goodness," continued Elinor, "no one can, I think, be in doubt who has seen him often enough to engage him in unreserved conversation. The excellence of his understanding and his principles can be concealed only by that shyness which too often keeps him silent, and you know enough of him to do justice to his solid worth. But of his minuter propensities, as you call them, you have from peculiar circumstances been kept more ignorant than myself. He and I have been at times thrown a good deal together, while you have been wholly engrossed on the most affectionate principle by my mother, and I have seen a great deal of him, have studied his sentiments and heard his opinion on subjects of literature and taste, and, upon the whole, I venture to pronounce that his mind is well-informed, his enjoyment of books exceedingly great, his imagination lively, his observation just and correct, and his taste delicate and pure. His abilities in every respect improve as much upon acquaintance as his manners and person. At first sight, his address is certainly not striking, and his person can hardly be called handsome, till the expression of his eyes, which are uncommonly good, and the general sweetness of his countenance, is perceived. At present, I know him so well that I think him really handsome, or at least almost so. What say you, Marianne?"

"I shall very soon think him handsome, Elinor, if I do not now. When you tell me to love him as a brother, I shall no more see imperfection in his face than I now do in his heart."