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

There's a tendency for people who believe passionately in something to be so convinced of their rightness that if they just repeat themselves a lot at the person, that will convince them. And that hasn't worked on things like immigration or trade deals.

Until you have looked in depth at the system and found out where women in Egypt are not being cut through female genital mutilation, or where kids in Vietnam are not malnourished, or where hospitals in America are getting rid of the superbugs anyway - unless you have that level of curiosity about what's going on without you, you will always come in with your great new recipe and just ignore what's going on, and that will make you much less effective at what you're trying to achieve.

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.

Economists who studied in the '80s tend to have a pretty crude neoclassical view that's just about freeing up prices and markets, and then you'll get the growth and everybody benefits. And they'll just repeat that, because if you're a minister or a senior civil servant, you don't have time to read anything anymore. You get very fixed in your views.

You have a huge number of people who spend their time writing papers which show that migrants pay more to the country than they take out in benefits, and they say, "Why don't you approve of migration? Why don't you open up borders?" They're not able to empathize with how people feel about migration.

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.