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Carl Sagan

"Everything not forbidden by the laws of nature, he assured her - quoting a colleague down the hall - is mandatory."

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"Everything not forbidden by the laws of nature, he assured her - quoting a colleague down the hall - is mandatory."

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Donna Grant

"We seldom make logical mistakes, but often have mistaken logics."

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Personal Development

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Donna Grant

"A thousand minus one is never a thousand."

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Personal Development

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Donna Grant

"In order to disprove the assertion that all crows are black, one white crow is sufficient."

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Personal Development

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Donna Grant

"I was upset. I had always believed logic was a universal weapon and now I realized how its validity depended on the way it was employed."

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Personal Development

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Donna Grant

"A narrow hallway is all that separates rational from irrational, creativity from insanity, and intelligence from stupidity."

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Personal Development

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Donna Grant

"The existence of a majority logically implies a corresponding minority."

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Personal Development

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Donna Grant

"Many people have said to me that I'm a mystic. I find that a bit mysterious. I just use logic and common sense for my philosophies."

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Personal Development

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Donna Grant

"Arguments cannot be answered by personal abuse; there is no logic in slander, and falsehood, in the long run, defeats itself."

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Personal Development

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Donna Grant

"Logic, n. The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding. The basic of logic is the syllogism, consisting of a major and a minor premise and a conclusion - thus:Major Premise: Sixty men can do a piece of work sixty times as quickly as one man.Minor Premise: One man can dig a post-hole in sixty seconds; Therefore-Conclusion: Sixty men can dig a post-hole in one second.This may be called syllogism arithmetical, in which, by combining logic and mathematics, we obtain a double certainty and are twice blessed."

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Donna Grant

"Pattern Thinking is a type of problem-solving thinking."

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Carl Sagan
"We are all flawed and creatures of our times. Is it fair to judge us by the unknown standards of the future?"

Ethics

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Carl Sagan
"You squeeze the eyedropper, and a drop of pond water drips out onto the microscope stage. You look at the projected image. The drop is full of life - strange beings swimming, crawling, tumbling; high dramas of pursuit and escape, triumph and tragedy. This is a world populated by beings far more exotic than in any science fiction movie..."

Science

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Carl Sagan
"Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense."

Science

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Carl Sagan
"Personally, I would be delighted if there were a life after death, especially if it permitted me to continue to learn about this world and others, if it gave me a chance to discover how history turns out."

History

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Carl Sagan
"I am often amazed at how much more capability and enthusiasm for science there is among elementary school youngsters than among college students."

Science

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Carl Sagan
"When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it."

Earth

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Carl Sagan
"There are many hypotheses in science which are wrong. That's perfectly all right: it's the aperture to finding out what's right. Science is a self-correcting process."

Science

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Carl Sagan
"There are no forbidden questions in science, no matters to sensitive or delicate to be probed, no sacred truths. That openness to new ideas, combined with the most rigorous, skeptical scrutiny of all ideas, sifts the wheat from the chaff. It makes no difference how smart, august, or beloved you are. You must prove your case in the face of determined, expert criticism. Diversity and debate are valued. Opinions are encouraged to contend"substantively and in depth."

Science

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Carl Sagan
"We are all star stuff."

Science

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Carl Sagan
"The truth may be puzzling. It may take some work to grapple with. It may be counterintuitive. It may contradict deeply held prejudices. It may not be consonant with what we desperately want to be true. But our preferences do not determine what's true."

Truth

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