Freedom of thought, belief, speech, and expression is a principle long cherished in the West. In recent years it has come under the most sustained attack I have seen in my lifetime, from multiple quarters. I believe it is worth defending, and it’s time to say more about why.

On Liberty, generally attributed to the English philosopher John Stuart Mill, is the most famous and widely cited defence of this principle, and for good reason. I had a low opinion of Mill for a while, as his Utilitarianism did a bad job, overall, of defending the utilitarianism I broke from – and that was one of the key reasons I broke from it. But On Liberty is an entirely different story. It provides a powerful and, I think, largely correct defence of free thought and speech on two grounds – neither of which is particularly utilitarian!

Perhaps the difference is because it now seems likely the book was co-written with Harriet Taylor Mill, John Stuart’s wife – probably published without the woman’s name on it to make a Victorian audience to take it more seriously. (For that reason I’ll refer to On Liberty as written by “the Mills”.) It might be that Harriet was less of a utilitarian than John. But the point here is the two big grounds that the Mills provide for why freedom of speech is important.