We only regret that it is unfit for the world, because the world is unworthy of it, and because it must expose the person who is endowed with it as a prey to the perfidy and ingratitude of insinuating falsehood, and to a thousand pains and uneasinesses, which, of all men, he the least deserves to feel, and which generally too he is, of all men, the least capable of supporting.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“It is always with concern, with sympathy and kindness, that we blame them for the extravagance of their attachment. There is a helplessness in the character of extreme humanity which more than any thing interests our pity. There is nothing in itself which renders it either ungraceful or disagreeable. We only regret that it is unfit for the world, because the world is unworthy of it, and because it must expose the person who is endowed with it as a prey to the perfidy and ingratitude of insinuating falsehood, and to a thousand pains and uneasinesses, which, of all men, he the least deserves to feel, and which generally too he is, of all men, the least capable of supporting. It is quite otherwise with hatred and resentment. Too violent a propensity to those detestable passions, renders a person the object of universal dread and abhorrence, who, like a wild beast, ought, we think, to be hunted out of all civil society.” source