I wondered if sometimes the difference between a psychopath in Broadmoor and a psychopath on Wall Street was the luck of being born into a stable, rich family.

‎I have panicked unnecessarily in all four corners of the globe.

I think if somebody is so set in their ways about what they feel about something - and you get this a lot in academia, of course, and also different sorts of journalism too - you're going to sweep under the carpet the facts that don't suit your thesis. And I think that happens quite a lot in the courtroom, for instance.

My worryingly paradoxical thought process could be summarized thus: Thank God I don't believe in the secret rulers of the world. Imagine what the secret rulers of the world might do to me if I did!

Trying to prove you’re not a psychopath is even harder than trying to prove you’re not mentally ill,’ said Tony.

When I asked Robert Spitzer about the possibility that he'd inadvertently created a world in which ordinary behaviours were being labelled mental disorders, he fell silent. I waited for him to answer. But the silence lasted three minutes. Finally he said, 'I don't know.

Sometimes labeling is only useful, like with OCD. Once you're labeled you can be treated. On other occasions labeling leads to tyranny, like with childhood bipolar disorder in the U.S.