Adam Smith on the ridiculousness of romantic love (1759)

Even of the passions derived from the imagination, those which take their origin from a peculiar turn or habit it has acquired, though they may be acknowledged to be perfectly natural, are, however, but little sympathized with. The imaginations of mankind, not having acquired that particular turn, cannot enter into them; and such passions, though they may be allowed to be almost unavoidable in some part of life, are always, in some measure, ridiculous. This is the case with that strong attachment which naturally grows up between two persons of different sexes, who have long fixed their thoughts upon one another. Our imagination not having run in the same channel with that of the lover, we cannot enter into the eagerness of his emotions. If our friend has been injured, we readily sympathize with his resentment, and grow angry with the very person with whom he is angry. If he has received a benefit, we readily enter into his gratitude, and have a very high sense of the merit of his benefactor. But if he is in love, though we may think his passion just as reasonable as any of the kind, yet we never think ourselves bound to conceive a passion of the same kind, and for the same person for whom he has conceived it. The passion appears to every body, but the man who feels it, entirely disproportioned to the value of the object; and love, though it is pardoned in a certain age because we know it is natural, is always laughed at, because we cannot enter into it. All serious and strong expressions of it appear ridiculous to a third person; and though a lover may be good company to his mistress, he is so to nobody else.