The Theory of Moral Sentiments by Adam Smith

Our sympathy with sorrow, though not more real, has been more taken notice of than our sympathy with joy. The word sympathy, in its most proper and primitive signification, denotes our fellow-feeling with the sufferings, not that with the enjoyments, of others. A late ingenious and subtle philosopher thought it necessary to prove, by arguments, that we had a real sympathy with joy, and that congratulation was a principle of human nature. Nobody, I believe, ever thought it necessary to prove that compassion was such.

First of all, our sympathy with sorrow is, in some sense, more universal than that with joy. Though sorrow is excessive, we may still have some fellow-feeling with it. What we feel does not, indeed, in this case, amount to that complete sympathy, to that perfect harmony and correspondence of sentiments, which constitutes approbation. We do not weep, and exclaim, and lament, with the sufferer. We are sensible, on the contrary, of his weakness and of the extravagance of his passion, and yet often feel a very sensible concern upon his account. But if we do not entirely enter into, and go along with, the joy of another, we have no sort of regard or fellow feeling for it. The man who skips and dances about with that intemperate and senseless joy which we cannot accompany him in, is the object of our contempt and indignation.