We can never be sure that the opinion we are endeavouring to stifle is a false opinion; and even if we were sure, stifling it would be an evil still.
Interpretation
Censoring opinions, even if deemed false, is morally wrong as it undermines truth and freedom of expression.
John Stuart Mill highlights the moral and philosophical implications of suppressing dissenting opinions. He argues that we cannot definitively know if an opinion is false, and even if we do believe it to be false, attempting to silence it is ethically wrong because it stifles discourse and undermines the pursuit of truth. The freedom to express all opinions, including unpopular ones, is essential for a healthy society and its moral development.
In practice
In a debate about free speech, one might quote Mill to emphasize the importance of allowing all 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.
There's a pervading sense of loneliness I've had since the day I was born. Maybe a lot of other people feel the same way, but I'm not about to run up and down the street asking everybody if they're as lonely as I am. I'd probably get locked up.
The cosmos is within us. We are made of star stuff
It's hard to know when to respond to the seductiveness of the world and when to respond to its challenge. If the world were merely seductive, that would be easy. If it were merely challenging, that would be no problem. But I arise in the morning torn between the desire to improve the world and a desire to enjoy the world. This makes it hard to plan the day.
The Cosmos is all that is or was or ever will be. Our feeblest contemplations of the Cosmos stir us -- there is a tingling in the spine, a catch in the voice, a faint sensation, as if a distant memory, of falling from a height. We know we are approaching the greatest of mysteries.
All men alike stand condemned, not by alien codes of ethics, but by their own, and all men therefore are conscious of guilt.
The poor are great! The poor are wonderful! The poor are very generous! They give us much more than what we give them.
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