I have to be sure of myself - in a conditional way, always being open to the possibility that I'm wrong.

I see [activists] getting really angry that people won't just do what the evidence tells them, and that's not very helpful. You need to actually think why that is.

What you don't do is just say, "I've got all the ideas and all the knowledge, and listen to me."

There's no point in just hankering for the big trade unions of the 1950s or '60s.

People think there's a single solution to complex problems, and the solution is often making an enemy of a group of people - pulling back and rejecting the other.

The death of deference seems to be general at the moment, so everybody has to earn their reputation and trust all over again. You don't just get it by virtue of being a professor or a politician or anybody else.

I keep coming back to the phrase "Dance with the system" - not just march onwards no matter what happens.