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.

Oliver Wendell Holmes, Jr. (1841-1935) American jurist, Supreme Court Justice
Abrams v. United States, 250 U.S. 616, 630 (1919) [Dissent]