In Germany, they first came for the Communists, and I didn't speak up because I wasn't a Communist. Then, they came for the Jews, and I didn't speak up because I wasn't a Jew. Then they came for the Catholics. I didn't speak up because I was a Protestant. Then they came for me, and there was no one left to speak up.
-- Rev. Martin Neimoller, German Lutheran pastor, arrested by the Gestapo in 1937

I diapprove of what you say, but I will defend to the death your right to say it.
-- Voltaire

If we don't believe in freedom of expression for people we despise, we don't believe in it at all.
-- Noam Chomsky