We need physical exercise to prepare our brain for long periods of concentration

I have had some great successes and great failures. I think every entrepreneur has. I try to learn from all of them.

You can't win a majority mandate unless you get back 60 per cent of the votes between the ages of 18 and 35. It's a fact.

My partners... taught me that in order to create wealth, I needed to pair up with people whose strengths compensated for my weaknesses.

When you bring an idea that has no merit to me, and you ask me to comment on it, I'm going to tell you it has no merit.

I'm starting to think about things that I want to do, things that are fun. One of them is driving a car like a Porsche. I've driven a lot of cars - sedans, trucks and big family vehicles all year long. But there's nothing like a four-wheel-drive Porsche.

I look at Twitter as brand building.