Our enemy is Al Qaeda and its allies, people who have publicly said they wish to attack the United States again, people who have publicly called on nuclear physicists and engineers to help them gain access to nuclear weapons, which, as the whole world knows, Pakistan has.

World War I was not inevitable, as many historians say. It could have been avoided, and it was a diplomatically botched negotiation.

I still believe in the possibility of the United States, with all its will and all its strength, and I don't just mean military, persevering against any challenge. I still believe in that.

Know something about something. Don’t just present your wonderful self to the world. Constantly amass knowledge and offer it around.

I think history is continuous. It doesn't begin or end on Pearl Harbor Day or the day Lyndon Johnson withdraws from the presidency or on 9/11. You have to learn from the past but not be imprisoned by it. You need to take counsel of history but never be imprisoned by it.

A peace deal requires agreements, and you don't make agreements with your friends, you make agreements with your enemies.

There is a split between Muslims who want to practice their faith in peace and tolerance with other religions and other people, and these extreme, radical fundamentalists who have shown a total lack of tolerance for people with different views, starting with people who they don't think are good Muslims, and going on to include Christians and Jews.