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

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.

In diplomacy, as in life itself, one often learns more from failures than from successes. Triumphs will seem, in retrospect, to be foreordained, a series of brilliant actions and decisions that may in fact have been lucky or inadvertent, whereas failures illuminate paths and pitfalls to be avoided.

It's an improvisation on a theme. You know where you want to go, but you don't know how to get there. It's not linear.

United Nations peacekeepers are going all over the world spreading AIDS even while they're trying to bring peace. What a supreme irony.

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

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