We have a chance here to prove that [Rwanda], a country that almost slaughtered itself out of existence, can practice reconciliation, reorganize itself, focus on tomorrow and provide comprehensive, quality health care with minimal outside help.

I know that the precise magnitude and patterns of climate change cannot be fully predicted. But global warming clearly is a growing, long-term threat with profound consequences. And make no mistake about it, it will take decades to reverse.

As we have throughout this century, we will lead with the power of our example, but be prepared, when necessary, to make an example of our power.

The era of big government is over, but the era of big challenge is not. We need an era of big citizenship. There are many important people at this summit, but the most important title is 'citizen.' This is our republic. Let us keep it!

[They let] friendship with the leaders in China obscure our devotion to freedom and democracy when those kids set up in Tiananmen Square, and I think it was wrong.

I've gained first hand knowledge of the challenges faced by people with disabilities. It's made me understand that those of us who have full use of our physical faculties owe an enormous amount of respect and sensitivity to people who don't.

If you wanna maintain 20 percent of the world's income with 4 percent of the world's people, you gotta first of all have more shared prosperity and shared growth.