Full and free expression of the right by the citizen is ordinarily also his duty; for its exercise is more important to the Nation than it is to himself. Like the course of the heavenly bodies, harmony in national life is a resultant of the struggle between contending forces. In the frank expression of conflicting opinions lies the greatest promise of wisdom in governmental action.

Louis Brandeis (1856-1941) American lawyer, activist, Supreme Court Justice (1916-39)

Gilbert v. Minnesota, 254 US 325 (1920) [Dissent]