Religions that teach brotherly love have been used as an excuse for persecution, and our profoundest scientific insight is made into a means of mass destruction.

To teach how to live without certainty and yet without being paralysed by hesitation is perhaps the chief thing that philosophy, in our age, can do for those who study it.

Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or ignorance.

I think we ought always to entertain our opinions with some measure of doubt. I shouldn't wish people dogmatically to believe any philosophy, not even mine.

The world's people all share the earnest aspiration to have peace, stability, justice and cooperation.

We had better dispense with the personification of evil, because it leads, all too easily, to the most dangerous kind of war: religious war.

In one way or another, President Obama's critics will dog him all the way to Oslo for the Nobel Peace Prize ceremony, and even his admirers will continue to have doubts about his accomplishments if not his promise.

I think that my parents wanted my brother and I to do what they couldn't have done and live a free life and not worry about war.