The Difference between Criticism and Complaint
Criticism as I understand it differs entirely from attack or complaint. Its difference from complaint is especially important here, for I am persuaded that complaints against the machinations of culture today have become as poisonous as the things complained of. This is not surprising. Resentment and indignation are feelings dangerous to the possessor and to be sparingly used. They give comfort too cheaply; they rot judgment, and by encouraging passivity they come to require that evil continue for the sake of the grievance to be enjoyed.
Criticism, on the contrary, aims at action. True, not all objects can be acted on at once, and many will not be reshaped according to desire; but thought is plastic and within our control, and thought is a form of action. To come to see, in the light of criticism, a situation as different from what it seemed to be, is to have accomplished an important act.
— A Jacques Barzun Reader (2002) / Jacques Barzun, Science: The Glorious Entertainment (1964).
See Comments to June Adoremus Bulletin in The New Liturgical Movement.