Full and free exercise of this 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 frank expression of conflicting opinion lies the greatest promise of wisdom in governmental action; and in suppression lies ordinarily the greatest peril.

Louis Dembitz Brandeis
Another Quote

The Power Of Failure: We Get To Decide What It Means