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.”
– Felix Frankfurter – (1882-1965) U.S. Supreme Court Justice
Source: Concurring Opinion, Dennis et al. v. U.S. (1951)
Freedom to differ is not limited to things that do not matter much. That would be a mere shadow of freedom. The test of its substance is the right to differ as to things that touch the heart of the existing order.
– Justice Robert H. Jackson – (1892-1954), U. S. Supreme Court Justice
Source: West Virginia State Board of Education v. Barnette, 1943