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Once you become self-conscious, there is no end to it; once you start to doubt, there is no room for anything else.

 

Mignon McLaughlin

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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 damn 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.

 

Richard Feynman

 

My favourite memories involve the actual process of writing sketches - just a few guys lounging around in a room talking nonsense, until suddenly an idea would start to coalesce, and you'd start nudging it toward fruition. I've never laughed so much before or since. Also, there were those very, very few nights where you'd be on a stage and some strange contract developed between performers and audience, and everything you did was funny. That was magical - and a direct visceral experience that you never really get from writing prose.

 

Michael Marshall Smith

 

Consciousness is a much smaller part of mental life than we are conscious of, since we cannot be conscious of what we aren’t conscious of.

 

Julian Jaynes

 

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

 

Sometimes when I'm having a boring interview on the telephone, and I'm trying to think about something else because the questions are too boring, and I start looking around the room where I work, you know, full of books piled up to the sky, all different kinds of topics. I start calculating how many centuries would I have to live reading twenty-four hours a day every day of the week to make a dent in what I'd like to learn about things, it's pretty depressing.[...] You know, we have little bits of understanding, glimpses, a little bit of light here and there, but there's a tremendous amount of darkness, which is a challenge. I think life would be pretty boring if we understood everything. It's better if we don't understand anything... and know that we don't, that's the important part.

 

Noam Chomsky