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" 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
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" 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. "
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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. "
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" 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. "
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" The universe is not required to be in perfect harmony with human ambition. "
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" For small creatures such as we the vastness is bearable only through love. "
Carl Sagan
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" Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense. "
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Deep
Which
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" 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. "
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Wish
Today
Opportunity
" Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. "
Carl Sagan
Lost
Live
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" 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
" A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism. "
Carl Sagan
Good Idea
Clergy
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" 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
" 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
Direction
Black
Darkness
" 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
" The Earth is a very small stage in a vast cosmic arena. "
Carl Sagan
Cosmic
Small
Stage
" We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. "
Carl Sagan
Technology
Live
Society
" The professed function of the nuclear weapons on each side is to prevent the other side from using their nuclear weapons. If that's all it is, then we've gotta as: how many nuclear weapons do you need to do that? "
Carl Sagan
Nuclear Weapons
You
Side
" Most of the people that I deal with are human. So I've had a lot of experience with that. "
Carl Sagan
Deal
Experience
Most
" If you wish to make an apple pie from scratch, you must first invent the universe. "
Carl Sagan
You
Pie
Wish
" 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
" 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're in very bad trouble if we don't understand the planet we're trying to save. "
Carl Sagan
Understand
Trouble
Bad
" The universe seems neither benign nor hostile, merely indifferent. "
Carl Sagan
Nor
Indifferent
Universe
" 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
" The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. "
Carl Sagan
Brain
Understanding
Intelligence
" 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
" Even these stars, which seem so numerous, are as sand, as dust - or less than dust - in the enormity of the space in which there is nothing. "
Carl Sagan
Stars
Space
Seem
" It's been said that astronomy is a humbling and, I might add, a character-building experience. "
Carl Sagan
Add
Said
Experience
" Imagination will often carry us to worlds that never were. But without it we go nowhere. "
Carl Sagan
Go
Will
Never
" We've arranged a civilization in which most crucial elements profoundly depend on science and technology. "
Carl Sagan
Science
Most
Technology
" 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