Persecution for the expression of opinions seems to me perfectly logical. If you have no doubt of your premises or your power, and want a certain result with all your heart, you naturally express your wishes in law, and sweep away all opposition. To allow opposition by speech seems to indicate that you think the speech impotent, as when a man says that he has squared the circle, or that you do not care wholeheartedly for the result, or that you doubt either your power or your premises. 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. Every year, if not every day, we have to wager our salvation upon some prophecy based upon imperfect knowledge. While that experiment is part of our system, I think that we should be eternally vigilant against attempts to check the expression of opinions that we loathe and believe to be fraught with death, unless they so imminently threaten immediate interference with the lawful and pressing purposes of the law that an immediate check is required to save the country. I wholly disagree with the argument of the Government that the First Amendment left the common law as to seditious libel in force. History seems to me against the notion. I had conceived that the United States, through many years, had shown its repentance for the Sedition Act of 1798, by repaying fines that it imposed. Only the emergency that makes it immediately dangerous to leave the correction of evil counsels to time warrants making any exception to the sweeping command, “Congress shall make no law . . . abridging the freedom of speech.” Of course, I am speaking only of expressions of opinion and exhortations, which were all that were uttered here, but I regret that I cannot put into more impressive words my belief that, in their conviction upon this indictment, the defendants were deprived of their rights under the Constitution of the United States.
Abrams v. United States, 250 U.S. 616 (1919), J. Holmes dissenting, emphasis added.