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

I cannot think of a more personally rewarding and appropriate use of wealth than to give while one is living.... Interventions have greater value and impact today than if they are delayed.

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

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

I cannot think of a more personally rewarding and appropriate use of wealth than to give while one is living - to personally devote oneself to meaningful efforts to improve the human condition. More importantly, today's needs are so great and varied that intelligent philanthropic support and positive interventions can have greater value and impact today than if they are delayed when the needs are greater.

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

There has to be a balance in life. A balance of business, family, and the opportunity to learn and teach.