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" When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it. "
Carl Sagan
Yourself
You
Light
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" The universe is not required to be in perfect harmony with human ambition. "
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" I've written a number of books that have to do with the evolution of humans, human intelligence, human emotions. "
Carl Sagan
Human
Intelligence
Evolution
" If we long to believe that the stars rise and set for us, that we are the reason there is a Universe, does science do us a disservice in deflating our conceits? "
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" There is a wide, yawning black infinity. In every direction, the extension is endless; the sensation of depth is overwhelming. And the darkness is immortal. Where light exists, it is pure, blazing, fierce; but light exists almost nowhere, and the blackness itself is also pure and blazing and fierce. "
Carl Sagan
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Darkness
" The Earth is a very small stage in a vast cosmic arena. "
Carl Sagan
Cosmic
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Stage
" Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense. "
Carl Sagan
Deep
Which
Religion
" A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism. "
Carl Sagan
Good Idea
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" In our obscurity - in all this vastness - there is no hint that help will come from elsewhere to save us from ourselves. It is up to us. "
Carl Sagan
Will
Up
Save
" The universe seems neither benign nor hostile, merely indifferent. "
Carl Sagan
Nor
Indifferent
Universe
" Absence of evidence is not evidence of absence. "
Carl Sagan
Evidence
Absence
" We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces. "
Carl Sagan
Ignorance
Technology
Power
" All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal value. "
Carl Sagan
Value
American
Technology
" The dangers of not thinking clearly are much greater now than ever before. It's not that there's something new in our way of thinking - it's that credulous and confused thinking can be much more lethal in ways it was never before. "
Carl Sagan
New
Way
Thinking
" If you wish to make an apple pie from scratch, you must first invent the universe. "
Carl Sagan
You
Pie
Wish
" Our posturings, our imagined self-importance, the delusion that we have some privileged position in the universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. "
Carl Sagan
Light
Great
Dark
" Today, we're still loaded down - and, to some extent, embarrassed - by ancient myths, but we respect them as part of the same impulse that has led to the modern, scientific kind of myth. But we now have the opportunity to discover, for the first time, the way the universe is in fact constructed as opposed to how we would wish it to be constructed. "
Carl Sagan
Wish
Today
Opportunity
" Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. "
Carl Sagan
How
Minds
Awake
" But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright Brothers. But they also laughed at Bozo the Clown. "
Carl Sagan
Columbus
Brothers
Clown
" You probably don't need more weapons than what's required to destroy every city on earth. There's only 2,300 cities. So, the United States, by that criteria, only needs 2,300 nuclear weapons - well, we've got more than 25,000! "
Carl Sagan
Destroy
Need
You
" We start out a million years ago in a small community on some grassy plain; we hunt animals, have children, and develop a rich social, sexual, and intellectual life, but we know almost nothing about our surroundings. "
Carl Sagan
Small
Children
Community
" We hunger to understand, so we invent myths about how we imagine the world is constructed - and they're, of course, based upon what we know, which is ourselves and other animals. So we make up stories about how the world was hatched from a cosmic egg or created after the mating of cosmic deities or by some fiat of a powerful being. "
Carl Sagan
Animals
Hunger
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" It's been said that astronomy is a humbling and, I might add, a character-building experience. "
Carl Sagan
Add
Said
Experience
" 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. "
Carl Sagan
Death
History
Learning
" The boundary between space and the earth is purely arbitrary. And I'll probably always be interested in this planet - it's my favorite. "
Carl Sagan
Planet
Favorite
Earth
" We've arranged a civilization in which most crucial elements profoundly depend on science and technology. "
Carl Sagan
Science
Most
Technology
" We are the representatives of the cosmos; we are an example of what hydrogen atoms can do, given 15 billion years of cosmic evolution. "
Carl Sagan
Evolution
Atoms
Years
" I am often amazed at how much more capability and enthusiasm for science there is among elementary school youngsters than among college students. "
Carl Sagan
Science
Education
School
" We're in very bad trouble if we don't understand the planet we're trying to save. "
Carl Sagan
Understand
Trouble
Bad
" Science is a way of thinking much more than it is a body of knowledge. "
Carl Sagan
Thinking
Way
Science
" I can find in my undergraduate classes, bright students who do not know that the stars rise and set at night, or even that the Sun is a star. "
Carl Sagan
Night
Know
I Can