As taste and good judgment, when they are considered as qualities which deserve praise and admiration, are supposed to imply a delicacy of sentiment and an acuteness of understanding not commonly to be met with; so the virtues of sensibility and self-command are not apprehended to consist in the ordinary, but in the uncommon degrees of those qualities. The amiable virtue of humanity requires, surely, a sensibility, much beyond what is possessed by the rude vulgar of mankind. The great and exalted virtue of magnanimity undoubtedly demands much more than that degree of self-command, which the weakest of mortals is capable of exerting. As in the common degree of the intellectual qualities, there is no abilities; so in the common degree of the moral, there is no virtue. Virtue is excellence, something uncommonly great and beautiful, which rises far above what is vulgar and ordinary. The amiable virtues consist in that degree of sensibility which surprises by its exquisite and unexpected delicacy and tenderness. The awful and respectable, in that degree of self-command which astonishes by its amazing superiority over the most ungovernable passions of human nature.
[Adam Smith, Theory of Moral Sentiments, I.1.45. It is interesting to find this juxtaposition outside of Sense and Sensibility, although it could just be a convergence or influence from the general ambience. But I'm not sure it is consistent with the general thrust of S&S to divide up virtues into sensibility-virtues and self-command-virtues like this.]