We have to be careful in negotiating with Iran that we don't create the impression among the Arab states and the Sunni states that we are working on a condominium between Iran and the United States, because that will panic them and drive them into making their own arrangement.

America has made it very clear in several administrations that if there is an attack by China on Taiwan, the United States is very likely to resist.

Diplomacy: the art of restraining power.

The important thing is to do the right thing. Then credibility will follow.

There is no realism without an element of idealism.

I grew up in Germany during the Nazi period, and I came to this country when I was 15. And then I had to work in a factory because we had no resources. And I went to night school. So, it was not a rational ambition for me to become a world statesman.

I have been observing China for more than 30 years and am impressed how logically and wisely it tackles its problems. Obviously the international system could be unbalanced by China's rising power - if we don't prepare ourselves for the new competitive situation, that is. But it is an economic challenge, not aggression on the level of Hitler.