Not the violent conflict between parts of the truth, but the quiet suppression of half of it, is the formidable evil; there is always hope when people are forced to listen to both sides; it is when they attend to only one that errors harden into prejudices, and truth itself ceases to have the effect of truth, by being exaggerated into falsehood.
Interpretation
The quote emphasizes the importance of hearing all sides of an argument to prevent the distortion of truth and the rise of prejudices.
John Stuart Mill highlights the danger of ignoring opposing viewpoints, which can lead to a misunderstanding of truth and entrenched biases. He suggests that genuine discourse, where both sides are heard, fosters hope and clarity, while the suppression of one side feeds misinformation and falsehoods.
In practice
In a debate about climate change, this quote can remind participants to consider all scientific perspectives.
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.
For after all, what is there behind, except money? Money for the right kind of education, money for influential friends, money for leisure and peace of mind, money for trips to Italy. Money writes books, money sells them. Give me not righteousness, O lord, give me money, only money.
What's left is palimpsest—one memory bleeding into another, overwriting it.
If your religion doesn't respect the rights of other religions, it is lacking something.
To an eagle or to an owl or to a rabbit, man must seem a masterful and yet a forlorn animal; he has but two friends. In his almost universal unpopularity he points out, with pride, that these two are the dog and the horse. He believes, with an innocence peculiar to himself, that they are equally proud of this alleged confraternity. He says, 'Look at my two noble friends -- they are dumb, but they are loyal.' I have for years suspected that they are only tolerant.
People consider the harms they inflict to be justified and forgettable, and the harms they suffer to be unprovoked and grievous.
And although I have seen nothing but black crows in my life, it doesn't mean that there's no such thing as a white crow. Both for a philosopher and for a scientist it can be important not to reject the possibility of finding a white crow. You might almost say that hunting for 'the white crow' is science's principal task.
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