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The first precept was never to accept a thing as true until I knew it as such without a single doubt.
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Pt. 2

 

Rene Descartes

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If I wanted to doubt then I could doubt endlessly. But at some point a person has to stop questioning and act, and at that point you have to trust something to be true. You have to act as if something is true, and so you choose the thing you have the most reason to believe in, you have to live in the world that you have the most hope in.

 

Orson Scott Card

 

History of science played a very important role for me. Before I knew well how to do an experiment, I knew why Joliot has missed the neutron, why his wife missed the fission, why they succeeded in having artificial radioactivity, and even why they almost missed the other things, by doing very nice experiments, but didn't come to the conclusion. That is science. Science is doubt, is research. It is not something which is – and that is the danger of teaching – which is too academic and which the people explain you it is like the logic thing that comes out of the computer, which is not true. You have intuition, you have passion.

 

Georges Charpak

 

We’re all so tied together. We’re all in a net, the net is waiting, and we’re pushed into it by one single desire. You want a thing and it’s precious to you. Do you who is standing ready to tear it out of your hands? You can’t know, it may be so involved and so far away, but someone is ready, and you’re afraid of them all. And you cringe and you crawl and you beg and you accept them- just so they’ll let you keep it. And look at whom you come to accept.

 

Ayn Rand

 

As to the objection that these rules are common in the world, that it is necessary to define every thing and to prove every thing, and that logicians themselves have placed them among their art, I would that the thing were true and that it were so well known... But so little is this the case, that, geometricians alone excepted, who are so few in number that they are a single in a whole nation and long periods of time, we see no others that know it.

 

Blaise Pascal

 

"And at last we've got to the end of this ideal racecourse! Now that you accept A and B and C and D, of course you accept Z."
"Do I?" said the Tortoise innocently. "Let's make that quite clear. I accept A and B and C and D. Suppose I still refused to accept Z?"
"Then Logic would take you by the throat, and force you to do it!" Achilles triumphantly replied. "Logic would tell you, 'You can't help yourself. Now that you've accepted A and B and C and D, you must accept Z!' So you've no choice, you see."
"Whatever Logic is good enough to tell me is worth writing down," said the Tortoise. "So enter it in your notebook, please. We will call it
(E) If A and B and C and D are true, Z must be true.
Until I've granted that, of course I needn't grant Z. So it's quite a necessary step, you see?"
"I see," said Achilles; and there was a touch of sadness in his tone.

 

Lewis Carroll