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 … - Richard Feynman

Scientific knowledge is a body of statements of varying degrees of certainty — some most unsure, some nearly sure, none absolutely certain.

that in order to progress we must recognize our ignorance and leave room for doubt.

Another time somebody gave a talk about poetry. He talked about the structure of the poem and the emotions that come with it; he divided everything up into certain kinds of classes. In the discussion that came afterwards, he said, “Isn’t that the same as in mathematics, Dr. Eisenhart?” Dr. Eisenhart was the dean of the graduate school and a great professor of mathematics. He was also very clever. He said, “I’d like to know what Dick Feynman thinks about it in reference to theoretical physics.” He was always putting me on in this kind of situation. I got up and said, “Yes, it’s very closely related. In theoretical physics, the analog of the word is the mathematical formula, the analog of the structure of the poem is the interrelationship of the theoretical bling-bling with the so-andso”–and I went through the whole thing, making a perfect analogy. The speaker’s eyes were _beaming_ with happiness. Then I said, “It seems to me that no matter _what_ you say about poetry, I could find a way of making up an analog with _any_ subject, just as I did for theoretical physics. I don’t consider such analogs meaningful.

I started to walk into the bar, and I suddenly thought to myself, “Wait a minute! It’s the middle of the afternoon. There’s nobody here. There’s no social reason to drink. Why do you have such a terribly strong feeling that you have to have a drink?” — and I got scared. I never drank ever again, since then. I suppose I really wasn’t in any danger, because I found it very easy to stop. But that strong feeling that I didn’t understand frightened me. You see, I get such fun out of thinking that I don’t want to destroy this most pleasant machine that makes life such a big kick. It’s the same reason that, later on, I was reluctant to try experiments with LSD in spite of my curiosity about hallucinations.

That’s the trouble with not being in your own field: You don’t take it seriously.