“The problem here is that there will always be some uncertainty about how quickly Saddam can acquire nuclear weapons. But we don’t want the smoking gun to be a mushroom cloud.”

You cannot be on one hand dedicated to peace and on the other dedicated to violence. Those two things are irreconcilable.

If you cannot allow people to do their jobs, nobody with substance and creativity will work for you.

What you know today can affect what you do tomorrow, but not what you did yesterday.

The people of the Middle East share the desire for freedom. We have an opportunity – and an obligation – to help them turn this desire into reality.

We can’t rely – or no country can rely on just a single personality to carry it forward. And so what the American founding fathers understood was that institutions were built for human imperfection not human perfection.

When somebody underestimated me, it made me want to prove them wrong.

People may oppose you, but when they realize you can hurt them, they’ll join your side.

I hope that all of us who were fortunate enough to have benefited will put our time, our resources and our efforts into making sure that kids, particularly kids without means, have a way to achieve.

NATO is built on security, but it’s also built on values.

Human beings are not perfect. Their institutions are not perfect, but they have to keep trying. And America has to help people keep trying.

The first step for a leader is to be right with yourself. Integrity is the basis of leadership.

Power is nothing unless you can turn it into influence.

Great leaders never accept the world as it was and always work for the world as it should be.

Differences can be strength rather than a handicap.

You might not be able to control your circumstances but you can control your response to your circumstances.

Separation of powers is a problem for foreign policy.