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.
Masonry is too great an institution to have been made in a day, much less by a few men, but was a slow evolution through long time, unfolding its beauty as it grew. Indeed, it was like one of its own cathedrals which one generation of builders wrought and vanished, and another followed, until, amidst vicissitudes of time and change, of decline and revival, the order itself became a temple of Freedom and Fraternity.
His face is livid, gaunt his whole body, his breath is green with gall; his tongue drips poison.
The museums of medieval Europe, from Holland to Tuscany, are crammed with instruments and devices upon which the holy men labored devoutly, in order to see how long they could keep someone alive while being roasted. It is not needful to go into further details, but there were also religious books of instruction in this art, and guides for the detection of heresy by pain.
Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear.
All necessary truth is its own evidence.
I was sure that somewhere a grandiose carnival was going on in the sky, and I was missing it.
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