To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

I assert that the cosmic religious experience is the strongest and the noblest driving force behind scientific research.

Common sense consists of those layers of prejudice laid down before the age of 18.

People will not disarm step by step; they will disarm at one blow or not at all.

What we don't know is much more than what we know.

A clever person solves a problem. A wise person avoids it.

The thinking it took to get us into this mess is not the same thinking that is going to get us out of it.