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

There was no silver bullet that could have prevented the 11 September attacks. There was nothing demonstrating or showing that something was coming in the United States. If there had been something, we would have acted on it.

We can't live true to our set of values unless American educational system is strong. I really believe that if we don't get that right we will not compete because we won't believe that our people can compete, and we'll turn inward. We won't lead. That will be bad for the world.

America cannot do most of what needs to be done alone. You need friends. And we have good friends around the world. We have friends with whom we share values in Europe and Asia - thanks to the forward march of democracy - in Latin America, in Africa, and increasingly in the Middle East.

I believe our Presidents work hard and it's the loneliest job in the world.

I don't think that anybody could have predicted that these people would take an airplane and slam it into the World Trade Center, take another one and slam it into the Pentagon, that they would try to use an airplane as a missile.

Arnold Rampersad is a really good person. A really good person. As a matter of fact, he came to Stanford when I was Provost.