Extraordinary claims require extraordinary evidence.
CARL SAGANNature is unsentimental. Death is built in.
More Carl Sagan Quotes
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We are like butterflies who flutter for a day and think it is forever.
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The significance of our lives and our fragile planet is then determined only by our own wisdom and courage.
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Arguments from authority carry little weight, authorities have made mistakes in the past. They will do so again in the future. Perhaps a better way to say it is that in science there are no authorities; at most, there are experts.
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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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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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Writing is the greatest of human inventions, binding together people, citizens of distant epochs, who never knew one another.
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Science is an attempt, largely successful, to understand the world, to get a grip on things, to get hold of ourselves, to steer a safe course.
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Extinction is the rule. Survival is the exception.
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Books permit us to voyage through time, to tap the wisdom of our ancestors.
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If you wish to make an apple pie from scratch, you must first invent the universe.
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The notion that science and spirituality are somehow mutually exclusive does a disservice to both.
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Understanding is a kind of ecstasy.
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The Earth is the only world known so far to harbor life.
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The total number of stars in the Universe is larger than all the grains of sand on all the beaches of the planet Earth.
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The price we pay for anticipation of the future is anxiety about it.
CARL SAGAN