I’m sure you’ve all heard the famous quote by
Voltaire.

          — I disagree
with what you say, but I will defend to the death your right to say it.

Well, actually I’m sure that first sentence isn’t
true, and not (just) because of your ignorance. The problem is that Voltaire never said it. (And not
just because he would have said it in French, the original quote is,
surprisingly enough, in English.) Goes to show that you shouldn’t believe
everything you hear around the traps.

(If you flick through all the details on that link,
you’ll see that Voltaire said similar things to this, but never exactly this.
The closest is a sentence from a letter translated as Monsieur
l’abbé, I detest what you write, but I would give my life to make it possible
for you to continue to write
. This is pretty close in spirit,
but I think it’s a stretch to translate that as the famous quote, particularly
since it refers to defending the general right of freedom of speech rather than
the particular right to assert the particular proposition at issue, and since
it doesn’t really talk about defence.)

Now there’s an interesting philosophical point
behind this. Now that you know Voltaire didn’t say this, do you think you could
have declined to believe that he did say it? Do you feel silly for having
formed a belief on too little evidence, or do you feel cheated by misleading
evidence? If the former, then you are committed to at least some kind of
voluntarism about belief, the thesis that what we believe is at least in part
determined by our will. Voluntarism has had a pretty poor press the last few
centuries or so, but cases like this suggest to me that a weak version of
voluntarism has to be true.

I got alerted to the fact that Voltaire didn’t make
this quote from this Guardian
column
by Richard Ingrams. (Scroll down to the last paragraph.) It also
says that Burke didn’t say All that is necessary for the
triumph of evil is that good men do nothing
. So I suppose
that I now believe that Burke didn’t say that, and perhaps you do to, or at
least you’ve stopped believing that Burke did say it.

On the other hand, Ingrams is at best sloppy at
attributing the Voltaire quote. He says it was said by somebody
called S. G. Tallentyne
, which isn’t strictly speaking
true. It was said by Beatrice Hall writing under the pen name S. G. Tallentyne.
So maybe we shouldn’t have trusted Ingrams on Burke.