On Liberty · Chapter
Of the Liberty of Thought and Discussion explained
Mill argues that silencing any opinion, even if false, is an evil because it robs humanity of the opportunity to exchange error for truth or to gain a clearer understanding of truth through its collision with error.
What happens
Mill argues that silencing any opinion, even if false, is an evil because it robs humanity of the opportunity to exchange error for truth or to gain a clearer understanding of truth through its collision with error. He contends that complete liberty of contradicting and disproving an opinion is the condition that justifies assuming its truth for action, and that all silencing of discussion assumes infallibility. He also addresses the manner of discussion, noting that intemperate language is often unfairly restricted to unpopular opinions while prevailing opinions use it with impunity.
Themes in this chapter
Liberty of Thought and Discussion
Central theme: Mill argues that complete freedom to contradict and disprove opinions is essential for rational assurance of truth and for human progress.
Tyranny of the Majority
Mill warns against the coercion of opinion by public authority acting as the organ of general intolerance, even when government is aligned with the people.
Custom and Conformity
Mill observes that people often defer to the opinions of their own 'world' (party, sect, class) without questioning that mere accident determines which worldview they adopt.
Characters to notice
- John Stuart Mill
Author and primary voice of the chapter, defending the liberty of thought and discussion against suppression by government or public opinion.
Key passages
“If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind.”
Even if everyone except one person agreed on an opinion, they would have no more right to silence that dissenter than the dissenter would have to silence everyone else.
Mill's foundational argument against the suppression of any opinion, regardless of how few hold it.
“All silencing of discussion is an assumption of infallibility.”
Whenever discussion is suppressed, the suppressor is claiming to be infallible in their certainty that the suppressed opinion is false.
Mill's key claim that suppressing debate implies an unwarranted claim to absolute certainty.
“We can never be sure that the opinion we are endeavouring to stifle is a false opinion; and if we were sure, stifling it would be an evil still.”
We can never be certain that the opinion we want to suppress is false, and even if we were certain, suppressing it would still be harmful.
Mill distinguishes two cases: the suppressed opinion might be true, or even if false, its suppression deprives us of the benefit of its collision with truth.