All civilizations become either spacefaring or extinct.
CARL SAGANOne of the great commandments of science is: Mistrust arguments from authority.
More Carl Sagan Quotes
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Nature is unsentimental. Death is built in.
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Books break the shackles of time, proof that humans can work magic.
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All over the world there are enormous numbers of smart, even gifted, people who harbor a passion for science.
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Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.
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I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves.
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The absence of evidence is not evidence of absence.
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The price we pay for anticipation of the future is anxiety about it.
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If I finish a book a week, I will read only a few thousand books in my lifetime, about a tenth of a percent of the contents of the greatest libraries of our time. The trick is to know which books to read.
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The universe seems neither benign nor hostile, merely indifferent.
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We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.
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The visions we offer our children shape the future.
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Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgement, the manner in which information is coordinated and used.
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Human beings have a demonstrated talent for self-deception when their emotions are stirred.
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You have to know the past to understand the present.
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I don’t want to believe. I want to know.
CARL SAGAN