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" 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
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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
" 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
" The universe is not required to be in perfect harmony with human ambition. "
Carl Sagan
Ambition
Perfect
Universe
" 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
" No other planet in the solar system is a suitable home for human beings; it's this world or nothing. That's a very powerful perception. "
Carl Sagan
World
Home
Solar
" 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
" We are not without empathetic terror when we open Pascal's 'Pensees' and read, 'I am the great silent spaces between worlds.' "
Carl Sagan
Without
Silent
Read
" If you wish to make an apple pie from scratch, you must first invent the universe. "
Carl Sagan
You
Pie
Wish
" 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 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
Know
" 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
People
" 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
" 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
" 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
" 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
" We've arranged a civilization in which most crucial elements profoundly depend on science and technology. "
Carl Sagan
Science
Most
Technology
" Imagination will often carry us to worlds that never were. But without it we go nowhere. "
Carl Sagan
Go
Will
Never
" 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
" 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
" The Earth is a very small stage in a vast cosmic arena. "
Carl Sagan
Cosmic
Small
Stage
" 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
" 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
" Science is a way of thinking much more than it is a body of knowledge. "
Carl Sagan
Thinking
Way
Science
" 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
" 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 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
" For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. "
Carl Sagan
Far
Universe
Better
" 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? "
Carl Sagan
Stars
Universe
Science
" Extinction is the rule. Survival is the exception. "
Carl Sagan
Exception
Rule
Extinction
" A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism. "
Carl Sagan
Good Idea
Clergy
Idea