The man who, by some sudden revolution of fortune, is lifted up all at once into a condition of life, greatly above what he had formerly lived in, may be assured that the congratulations of his best friends are not all of them perfectly sincere. An upstart, though of the greatest merit, is generally disagreeable, and a sentiment of envy commonly prevents us from heartily sympathizing with his joy.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“because no double sympathy can ever interest us for them. There is, however, this difference between grief and joy, that we are generally most disposed to sympathize with small joys and great sorrows. The man who, by some sudden revolution of fortune, is lifted up all at once into a condition of life, greatly above what he had formerly lived in, may be assured that the congratulations of his best friends are not all of them perfectly sincere. An upstart, though of the greatest merit, is generally disagreeable, and a sentiment of envy commonly prevents us from heartily sympathizing with his joy. If he has any judgment, he is sensible of this, and instead of appearing to be elated with his good fortune, he endeavours, as much as he can, to smother his joy, and keep down that elevation of mind with which his new circumstances naturally inspire him.” source