Give me the liberty to know, to utter, and to argue freely according to conscience, above all liberties.
John Milton
Without freedom of thought, there can be no such thing as wisdom; and no such thing as public liberty without freedom of speech; which is the right of every man as far as by it he does not hurt or control the right of another; and this is the only check it ought to suffer and the only bounds it ought to know.... Whoever would overthrow the liberty of a nation must begin by subduing the freedom of speech, a thing terrible to traitors.
By Benjamin Franklin
I do not agree with what you have to say, but I'll defend to the death your right to say it.
Liberty is meaningless where the right to utter one's thoughts and opinions has ceased to exist. That, of all rights, is the dread of tyrants. It is the right which they first of all strike down. They know its power. Thrones, dominions, principalities, and powers, founded in injustice and wrong, are sure to tremble, if men are allowed to reason... Equally clear is the right to hear. To suppress free speech is a double wrong. It violates the rights of the hearer as well as those of the speaker.
If liberty means anything at all, it means the right to tell people what they do not want to hear.
George Orwell
Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.
Winston Churchill
I have always strenuously supported the right of every man to his own opinion, however different that opinion might be to mine. He who denies to another this right, makes a slave of himself to his present opinion, because he precludes himself the right of changing it.
Thomas Paine
The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error.
John Stuart Mill
In Iran, there is no freedom of the press, no freedom of speech, no independent judiciary, no free elections. There is no freedom of religion - not even for Shiites, who are forced by Irans theocracy to adhere to one narrow set of official rules.
Elliott Abrams
To argue with a person who has renounced the use of reason is like administering medicine to the dead.
Thomas Paine
He who dares not offend cannot be honest.
Thomas Paine
If all mankind minus one were of one opinion, mankind would be no more justified in silencing that one person than he, if he had the power, would be justified in silencing mankind.
John Stuart Mill