Respectfully Quoted: A Dictionary of Quotations. 1989.
Oliver Wendell Holmes (18411935)
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 ideasthat 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.
Justice OLIVER WENDELL HOLMES, dissenting, Abrams et al. v. United States, 250 U.S. 630 (1919).