Except in pure mathematics, nothing is known for certain (although much is certainly false).
CARL SAGANBooks are like seeds. They can lie dormant for centuries and then flower in the most unpromising soil.
More Carl Sagan Quotes
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To live in the hearts we leave behind is to live forever.
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We are a way for the cosmos to know itself.
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Stars are phoenixes, rising from their own ashes.
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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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A book is made from a tree. It is an assemblage of flat, flexible parts (still called “leaves”) imprinted with dark pigmented squiggles.
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Understanding is a kind of ecstasy.
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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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One of the greatest gifts adults can give – to their offspring and to their society – is to read to children.
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Where we have strong emotions, we’re liable to fool ourselves.
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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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An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.
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The Earth is a very small stage in a vast cosmic arena.
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One of the great commandments of science is: Mistrust arguments from authority.
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The price we pay for anticipation of the future is anxiety about it.
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The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.
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We all have a thirst for wonder. It’s a deeply human quality. Science and religion are both bound up with it.
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Books are like seeds. They can lie dormant for centuries and then flower in the most unpromising soil.
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Nothing disturbs me more than the glorification of stupidity.
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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
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We live in a vast and awesome universe in which, daily, suns are made and worlds destroyed, where humanity clings to an obscure clod of rock.
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We make our world significant by the courage of our questions and the depth of our answers.
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If it can be destroyed by the truth, it deserves to be destroyed by the truth.
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Science is a way to not fool ourselves.
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Imagination will often carry us to worlds that never were, but without it we go nowhere.
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The absence of evidence is not evidence of absence.
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Other things being equal, it is better to be smart than to be stupid.
CARL SAGAN