But when men have realized that time has upset many fighting faiths, they may come to believe even more than they believe the very foundations of their own conduct that the ultimate good desired is better reached by free trade in ideas–that the best test of truth is the power of the thought to get itself accepted in the competition of the market, and that truth is the only ground upon which their wishes safely can be carried out. That, at any rate, is the theory of our Constitution. It is an experiment, as all life is an experiment.
A government can suppress a newsletter, a book, a man. But men of good intentions are standing. They close ranks. It will produce a strange migration of souls. And the just, noble, necessary Belief will bring forth, probably larger numbers, better disciplined where the adversary least expects them.
Dale Carpenter, Born in Dissent: Free Speech and Gay Rights, 72 SMU L. Rev. 375 (2019).