Setting clear goals and finding measures that will mark progress toward them can improve the human condition.

The only role other than paying their taxes, whatever those are, the only role for philanthropy broadly - of which the rich should give disproportionately - the more, the better - and I think there is a positive trend in that direction - there are certain risk-taking things, like trying out a new type of charter school or funding a new kind of medicine.

Why do people benefit in inverse proportion to their need? Well, market incentives make that happen.

I have an excellent memory, a most excellent memory.

Whenever there is hard work to be done, I assign it to the laziest man as he is sure to find an easy way of doing it. Be lazy, think crazy.

In American math classes, we teach a lot of concepts poorly over many years. In the Asian systems they teach you very few concepts very well over a few years.

The huge turnout for Live 8 here and around the world proves that thanks to the leadership from people like Tony Blair and Gordon Brown the world is beginning to demand more action on global health and poverty.