"To curtail free expression strikes twice at intellectual freedom, for whoever deprives another of the right to state unpopular views necessarily deprives others of the right to listen to those views."

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The history of intellectual growth and discovery clearly demonstrates the need for unfettered freedom, the right to think the unthinkable, discuss the unmentionable, and challenge the unchallengeable. To curtail free expression strikes twice at intellectual freedom, for whoever deprives another of the right to state unpopular views necessarily also deprives others of the right to listen to those views.

— Oliver Wendell Holmes, Jr.