The idea of selfish philanthropy is a push against the notion of philanthropy as simply 'giving back.' That phrase implies that wealth was accumulated by taking something from society. But if you've built a successful business, you've contributed to society—you don't owe anything back.

I feel it's such a wonderful thing to be able to leave the tyranny of gravity to leave the ground and fly wherever you will.

All the market research we have done shows that consumers use diamonds to mark special moments in their lives because they are timeless, have been in the ground 3 billion years and are unique. For all of those reasons, when you ask a consumer, particularly a woman, if they would be happy to have a synthetic diamond engagement ring? the answer is no…

Seventeen of the top twenty universities in the world are in the USA, one third of all students who leave their countries to study in another come to the USA. There are only a handful of countries who spend relatively more on R&D than the USA.

Before you think about the alpha, you have to think about the client's beta.

We have to remember – there's no Planet B, we have to protect Earth. Maybe eventually we'll make star ships, but that isn't happening for a thousand years. We need to figure out how to live here sustainably for the long term.

Young people see philanthropy and change completely differently – they don't support charities in the same way as I do, but they campaign and that's perhaps more valuable. The money is less important now, and the drive is the focus, the talking, the doing.

The reason why I fight is that I'm fighting against the pain of seeing my family get sick and fighting against not being able to help them. That's more painful than anything. To see my kids, get sick tomorrow and not being able to help them? That's more painful than anything I would experience in a fight.

In this industry, whether you're learning to act or write, you often develop skills in isolation. It's easy to see your own discipline as encompassing the whole creative universe. However, once you're on set, the reality of the collaboration involved becomes apparent very quickly.

One of the biggest myths in startup-land is this idea that the pinnacle of startups is building a venture-scale company, backed by venture capital, growing exceptionally fast and being OK with high failure rates as a result; in other words, returning a significant amount of capital to an investor rather than any other outcome.

Uncertainty creates a strategic incentive for a rational man to go to war. That's not necessarily a mistake as, at the moment, people may wish they had better information, but they may also realise they've made the optimal choice.

Taking that first step is your biggest competitive advantage; most people won't do it.