Never confuse education with intelligence, you can have a PhD and still be an idiot.

Maybe that is why young people make success. They don't know enough.

You see, one thing is, I can live with doubt and uncertainty and not knowing. I have approximate answers and possible beliefs and different degrees of certainty about different things... It doesn't frighten me.

We have found it of paramount importance that in order to progress, we must recognize our ignorance and leave room for doubt.

When a scientist doesn't know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of uncertainty-some most unsure, some nearly sure, but none absolutely certain.