Quotation

FREEDOM OF EXPRESSION

is the rule its limitation the exception
John Stuart Mill in his essay On Liberty in Utilitarianism Etc: (London, 1910) p 83:
". . . there ought to exist the fullest liberty of professing and discussing, as a matter of ethical conviction, any doctrine, however immoral it might be considered."
Voltaire:
"I disapprove of what you say, but I will defend to the death your right to say it."