The real lesson of 9/11 that I think we have still to learn is that this is a world of interdependence, in which all of the challenges of environment and climate change, of jobs, of disease, of war and terrorism, are cross-border problems that cannot be met one nation at a time.

Where once the student was taught that the unexamined life was not worth living, he is now taught that the profitably lived life is not worth examining.

The real lesson of 9/11 that I think we have still to learn is that this is a world of interdependence, in which all of the challenges of environment and climate change, of jobs, of disease, of war and terrorism, are cross-border problems that cannot be met one nation at a time.

I don't divide the world into the weak and the strong, or the successes and failures...I divide the world into the learners and non-learners.

Civility is a work of the imagination, for it is through the imagination that we render others sufficiently like ourselves for them to become subjects of tolerance and respect, if not always affection.

Having created the conditions that make markets possible, democracy must do all the things that markets undo or cannot do.

The question to ask is not whether you are a success or a failure, but whether you are a learner or a nonlearner.