In On Liberty (1859), John Stuart Mill offers the most compelling defence of freedom of speech, conscience and autonomy ever written. Mill argues that the only reason to restrict speech is to prevent harm to others, such as with hate speech and incitement to violence. Otherwise, all speech must be protected. Even if we know a view is false, Mill says, it is wrong to suppress it. We avoid prejudice and dogmatism, and achieve understanding, through freely discussing and defending what we believe against contrary claims. – Aeon