"Anyway, from what I've been able to work out, if you're going to claim that you know something, then it should be provable, otherwise how do you know you know it? Just being surrounded by lots of people who agree with you doesn't prove anything. (Well, it might prove quite a lot of things, actually, but not what you think it does, and quite likely not stuff you're going to be comfortable with, either.)"
-- Iain Banks, The Quarry, which is not his best book but is his last book, given that cancer is a right bastard. He is still missed.