"Freedom of expression is the well-spring of our civilization...
The history of civilization is in considerable measure
the displacement of error which once held sway as official truth
by beliefs which in turn have yielded to other truths.
Therefore the liberty of man to search for truth ought not
to be fettered, no matter what orthodoxies he may challenge."
Concurring Opinion, Dennis et al. v. U.S. (1951)
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