“We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty. People are terrified — how can you live and not know? It is not odd at all. You only think you know, as a matter of fact. And most of your actions are based on incomplete knowledge and you really don't know what it is all about, or what the purpose of the world is, or know a great deal of other things. It is possible to live and not know.”

— Richard Feynman , book The Pleasure of Finding Things Out

from lecture "What is and What Should be the Role of Scientific Culture in Modern Society", given at the Galileo Symposium in Italy (1964)
The Pleasure of Finding Things Out (1999)

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Richard Feynman 181

American theoretical physicist 1918–1988

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“We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty. People are terrified — how can you live and not know?”

Richard Feynman book The Pleasure of Finding Things Out

It is not odd at all. You only think you know, as a matter of fact. And most of your actions are based on incomplete knowledge and you really don't know what it is all about, or what the purpose of the world is, or know a great deal of other things. It is possible to live and not know.
from lecture "What is and What Should be the Role of Scientific Culture in Modern Society", given at the Galileo Symposium in Italy (1964)
The Pleasure of Finding Things Out (1999)

“Do you know what I think about crying? I think some people have to learn to do it. But once you learn, once you know how to really cry, there's nothing quite like it. I feel sorry for those who don't know the trick. It's like whistling or singing.”

Anne Rice book Memnoch the Devil

Source: Memnoch the Devil

“You really only know when you know little. Doubt grows with knowledge.”

Johann Wolfgang von Goethe (1749–1832) German writer, artist, and politician

Maxim 281, trans. Stopp
Variant translation: Only when we know little do we know anything. Doubt grows with knowledge.
Maxims and Reflections (1833)

“Never ask people. Not about your work. Don't you know what you want? How can you stand it, not to know?”

Ayn Rand book The Fountainhead

Source: The Fountainhead

“More and more, people see that solving any problem is a question of acquiring knowledge and having respect for the cognitive and epistemological processes involved in the human brain: use what you know, learn what you can, and if you have to guess, be aware that you do so you can go back and update your guesses when you (hopefully) learn more.”

Erik Naggum (1965–2009) Norwegian computer programmer

Re: is CLOS reall OO? http://groups.google.com/group/comp.lang.lisp/msg/917737b7cc8510e3?dmode=source&output=gplain (Usenet article).
Usenet articles, Miscellaneous

“Belief may be either rational, or assumed on faith. But in either case, it doesn’t matter how convinced you are; belief does not equal knowledge. The difference is that knowledge can always be tested for accuracy where mere beliefs often can not be. No matter how positively you think you know it, if you can’t show it, then you don’t know it, and you shouldn’t say that you do. Nor would you if you really cared about the truth. Knowledge is demonstrable, measurable. But faith is often a matter of pretending to know what you know you really don't know, and that no one even can know, and which you merely believe -often for no good reason at all.”

Aron Ra (1962) Aron Ra is an atheist activist and the host of the Ra-Men Podcast

"4th Foundational Falsehood of Creationism" https://www.youtube.com/watch?v=80nhqGfN6t8, Youtube (December 25, 2007)
Youtube, Foundational Falsehoods of Creationism

“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 certainty — some most unsure, some nearly sure, but none absolutely certain.”

Richard Feynman (1918–1988) American theoretical physicist

The Value of Science (1955)
Context: The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think. 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 certainty — some most unsure, some nearly sure, but none absolutely certain. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know. But I don’t know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.

“Perhaps as you went along you did learn something. I did not care what it was all about. All I wanted to know was how to live in it. Maybe if you found out how to live in it you learned from that what it was all about.”

Ernest Hemingway book The Sun Also Rises

Variant: I did not care what it was all about. All I wanted to know was how to live in it. Maybe if you found out how to live in it you learned from that what is was all about.
Source: The Sun Also Rises

“Some people say, "How can you live without knowing?" I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know.”

Richard Feynman book The Meaning of It All

lecture I: "The Uncertainty of Science"
The Meaning of It All (1999)

“The most troubling feeling in the world is to be aware of how much you know. Yet, you don't know how to apply that knowledge into action.”

Mwanandeke Kindembo (1996) Congolese author

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Richard Feynman 181

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