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

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

If a country denies it has AIDS, that country will inevitably become an even greater victim.

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.

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.

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

Bureaucracies have a natural tendency not to cooperate, coordinate or consolidate with each other. They won't cooperate with each other - unless they are forced to do so by political level authority.