We've learned from experience that the truth will out.

I have argued flying saucers with lots of people. I was interested in possible. They do not appreciate that the problem is not to demonstrate whether it's possible or not but whether it's going on or not.

Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it

A great deal more is known than has been proved.

If we want to solve a problem that we have never solved before, we must leave the door to the unknown ajar.

It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.

Fall in love with some activity, and do it! Nobody ever figures out what life is all about, and it doesn't matter.