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The first principle is that you must not fool yourself, and you are the easiest person to fool.
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From lecture "What is and What Should be the Role of Scientific Culture in Modern Society", given at the Galileo Symposium in Italy (1964).
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Variant: Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.

 

Richard Feynman

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Similar quotes

 

"If I am a fool then it is no misfortune, for then only one more fool will wander this Earth. Amongst the millions of mentally deranged it would barely be noticed. But what if I am not a fool, and that science itself has erred? Then the tragedy is incalculable!"

 

Viktor Schauberger

 

We think, I’m not a fool today. I’ve learned my lesson. I was a fool yesterday but not this morning. Then tomorrow we find out that, yes, we were a fool today too. I think the only way we can grow and get on in this world is to accept the fact we’re not perfect and live accordingly.

 

Ray Bradbury

 

Few human creatures would consent to be changed into any of the lower animals for a promise of the fullest allowance of a beast’s pleasures; no intelligent human being would consent to be a fool, no instructed person would be an ignoramus, no person of feeling and conscience would be selfish and base, even though they should be persuaded that the fool, the dunce, or the rascal is better satisfied with his lot than they are with theirs.

 

John Stuart Mill

 

it is true that you may fool all the people some of the time, you can fool some of the people all the time, but you can not fool all of the people all the time... dogs, on the other hand, with them all you need to do is flick your wrist and they run off looking for some stupid tennis ball. (famous cat quotes)

 

Darby Conley

 

I’m not trying to frighten you, but only a fool makes predictions based on ignorance; I am not that sort of fool.

 

Robert A. Heinlein