On why he has donated $600 million to selected charities. I simply decided I had enough money.

I believe strongly in 'giving while living.' I see little reason to delay giving when so much good can be achieved through supporting worthwhile causes today.

When you've got the money, you spend it. When you've spent it all, let someone else get going and spend theirs.

I had one idea that never changed in my mind - that you should use your wealth to help people.

On why he has donated $600 million to selected charities. I simply decided I had enough money.

I’m happy when what I’m doing is helping people and unhappy when what I’m doing isn’t helping people.

I set out to work hard, not to get rich.