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.
As for what is not true, you will always find abundance in the newspapers.
This stigma associated with drug use--the belief that bad kids use, good kids don't, and those with full-blown addiction are weak, dissolute, and pathetic--has contributed to the escalation of use and has hampered treatment more than any single other factor.
Sometimes a concept is baffling not because it is profound but because it is wrong.
Cities have always offered anonymity, variety, and conjunction, qualities best basked in by walking: one does not have to go into the bakery or the fortune-teller's, only to know that one might. A city always contains more than any inhabitant can know, and a great city always makes the unknown and the possible spurs to the imagination.
The poor is the center of the Gospel. If we take out the poor, we cannot understand the message of Christ
All miracles are promised to faith, and what is faith except the audacity of will which does not hesitate in the darkness, but advances towards the light in spite of all ordeals, and surmounting all obstacles?
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