Both President Kennedy and President Reagan were roundly criticized by parts of the foreign policy establishment that felt they were being weak by engaging our adversaries. So some of it is built into a political lexicon that makes you sound tougher if you don't talk to somebody, and rather, very loudly, wield a big stick.

We cannot continue to rely only on our military in order to achieve the national security objectives that we've set. We've got to have a civilian national security force that's just as powerful, just as strong, just as well-funded.

We're showing that there's no excuse for other nations to come together, both developed and developing, to achieve a strong global climate agreement next year.

I wonder, sometimes, whether men and women in fact are capable of learning from history--whether we progress from one stage to the next in an upward course or whether we just ride the cycles of boom and bust, war and peace, ascent and decline.

The greatest danger of all is to allow new walls to divide us from one another

I think it is possible for the world to see a Palestinian state - I'm not going to put a time frame on it - that is contiguous, that allows freedom of movement for its people, that allows for trade with other countries, that allows the creation of businesses and commerce so that people have a better life.

We are reaching a tipping where the pace of settlements, during the course of my presidency has gotten so substantial that it's getting harder and harder to imagine an effective, contiguous Palestinian state. And I think it would have long-term consequences for peace and security in the region, and the United States, because of our investment in the region, and because we care so deeply about Israel, I think has a legitimate interest in saying to a friend, "This is a problem."