Just in terms of allocation of time resources, religion is not very efficient. There's a lot more I could be doing on a Sunday morning.

If you believe that every life has equal value, it’s revolting to learn that some lives are seen as worth saving and others are not. We said to ourselves: “This can’t be true. But if it is true, it deserves to be the priority of our giving.”

The Green Revolution focused on the big three - maize, rice and wheat - and the Green Revolution did not adapt the big three to African conditions, other than South Africa, as much as they should have.

We are seeing smarter philanthropy, more philanthropy, and that's true world wide. So it's kind of a movement that has a lot of accomplishments, even though as a percentage of the economy, it's still only a few per cent.

If you’re a person struggling to eat and stay healthy you might have heard about Michael Jordan or Muhammad Ali, but you’ll never have heard of Bill Gates.

There is no doubt that as an economy grows in a great way like India has, that you have to step back and change your tax systems, because you start to get more disparities of wealth.

Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero.