Supreme Court Justice Oliver Wendell Holmes in his dissent in Abrams v. United States:

From: ANDREW COHEN, "The Most Powerful Dissent in American History: A smart new book [Thomas Healy, The Great Dissent: How Oliver Wendell Holmes Changed His Mind-- and Changed the History of Free Speech in America],  reveals precisely how and why Oliver Wendell Holmes changed his mind about the first amendment," theatlantic.com:

If there is a more relevant or powerful passage in American law, I am not aware of it. Relevant because it expressed a universal concept -- free trade in ideas -- that 125 years after the Constitution was ratified still had not yet taken hold in our democracy. Powerful because it went beyond legal precepts to a fundamental fact of human existence: We all make mistakes. We all have good opinions and bad ones. None of us are right all the time. All of us at one point or another have to respect what someone else says. And life is an experiment from the moment we wake in the morning until the moment we lay our heads down at night.

It's a passage written 94 years ago that both explains and preserves our op-ed pages and the Internet, talk-radio shows, and blogs, in the brilliant blending of two American institutions that were not always destined to go together: the free market and free speech. It's a passage that both acknowledges human weakness and strives to master it, that recognizes the roiling diversity of American thought and seeks to make something clear and profound from it. From United States Supreme Court Justice Oliver Wendell Holmes in his dissent in Abrams v. United States:

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.

Of course, the story of free speech in America neither begins nor ends with Abrams. But it is a clear pivot point.

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