We can never be sure that the opinion we are endeavoring to stifle is a false opinion; and if we were sure, stifling it would be an evil still.
Interpretation
Stifling opinions can be harmful, regardless of their truthfulness.
John Stuart Mill emphasizes the importance of freedom of thought and expression by arguing that we cannot objectively determine the falsehood of an opinion. Even if we could, suppressing that opinion would still be morally wrong, as it infringes on individual liberty and the exchange of ideas, which are essential for societal progress and understanding.
In practice
During a debate on social media, one might use this quote to remind others of the importance of allowing differing viewpoints.
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.
As for charity, it is a matter in which the immediate effect on the persons directly concerned, and the ultimate consequence to the general good, are apt to be at complete war with one another.
To think that because those who wield power in society wield in the end that of government, therefore it is of no use to attempt to influence the constitution of the government by acting on opinion, is to forget that opinion is itself one of the greatest active social forces. One person with a belief is a social power equal to ninety-nine who have only interests.
There should be perfect freedom, legal and social, to do the action and stand the consequences. It would be a great misunderstanding of this doctrine to suppose that it is one of selfish indifference, which pretends that human beings have no business with each other's conduct in life, and that they should not concern themselves about the well-doing or well-being of one another, unless their own interest is involved.
Political Economy, in truth, has never pretended to give advice to mankind with no lights but its own; though people who knew nothing but political economy (and therefore knew it ill) have taken upon themselves to advise, and could only do so by such lights as they had.
Marriage is the only actual bondage known to our law. There remain no legal slaves, except the mistress of every house.
Just as our brains fill in the details of an image our eyes record only roughly, so, too, do our brains employ tricks we are unaware of to fill in details about people we don't know intimately.
But guilt is guilt. It doesn't go away. It can't be nullified. It can't even be fully understood, I'm certain - it's roots run too deep into private and long-standing karma. About the only thing that saves my neck when I get to feeling this way is that guilt is an imperfect form of knowledge. Just because it isn't perfect doesn't mean that it can't be used. The hard thing to do is to put it to practical use, before it gets around to paralyzing you.
The Devil' is, historically, the God of any people that one personally dislikes... This serpent, SATAN, is not the enemy of Man, but He who made Gods of our race, knowing Good and Evil; He bade 'Know Thyself!' and taught Initiation. He is 'The Devil' of the Book of Thoth, and His emblem is BAPHOMET, the Androgyne who is the hieroglyph of arcane perfection... He is therefore Life, and Love.
The critic is a prisoner to his own experiences and perspectives, erroneously believing his limited experiences are the sum of all truth
Flaws and all, I believe the free press is our country's most important institution - one I am more than happy to defend. One I did, in fact, defend for 37 years.
I think looking back to my own childhood, the fact that so many of the stories I read allowed the possibility of frogs turning into princes, whether that has a sort of insidious affect on rationality, I'm not sure. Perhaps it's something for research.
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