The happiest people are those who are contributing to society.

Where's the upside in opening your mouth?

Music has a great power for bringing people together. With so many forces in this world acting to drive wedges between people, it's important to preserve those things that help us experience our common humanity.

I'm a very good thinker, but I sometimes grab the wrong word. I say something I didn't think through adequately. I mean, I don't type my speeches, then sit up there and read them off the teleprompter, you know. I wing it.

The U.N. had such lofty goals to eliminate poverty and stop war and cure diseases and help refugees - things that no one country could do.

There are too many people, that's why we have global warming. We have global warming because too many people are using too much stuff.

I just love it when people say I can't do something. There's nothing that makes me feel better, because all my life people have said I wasn't going to make it.