If you think of global public goods like polio eradication, the kind of risk-taking new approach, philanthropy really does have a role to play there, because government doesn't do R&D about new things naturally as much as it probably should, and so philanthropy's there.

Don't wallow in failure. Instead, learn from it.

In three years, every product my company makes will be obsolete. The only question is whether we will make them obsolete or somebody else will.

Like my friend Warren Buffett, I feel particularly lucky to do something every day that I love to do. He calls it "tap dancing to work."

I think it makes sense to believe in God, but exactly what decision in your life you make differently because of it, I don't know.

As you improve health in a society, population growth goes down. You know, I thought it was... before I learned about it, I thought it was paradoxical.

The best teacher is very interactive.