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" A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism. "
Carl Sagan
Good Idea
Clergy
Idea
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" 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
" 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
" 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
" 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
" 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
" 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
" 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
" 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
" The universe is not required to be in perfect harmony with human ambition. "
Carl Sagan
Ambition
Perfect
Universe
" The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. "
Carl Sagan
Brain
Understanding
Intelligence
" 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
" Imagination will often carry us to worlds that never were. But without it we go nowhere. "
Carl Sagan
Go
Will
Never
" 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
" 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
" 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
" 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
" 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
" 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
" Absence of evidence is not evidence of absence. "
Carl Sagan
Evidence
Absence
" 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
" 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
" Extinction is the rule. Survival is the exception. "
Carl Sagan
Exception
Rule
Extinction
" The universe seems neither benign nor hostile, merely indifferent. "
Carl Sagan
Nor
Indifferent
Universe
" For small creatures such as we the vastness is bearable only through love. "
Carl Sagan
Only
Small
Through
" 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
" Science is a way of thinking much more than it is a body of knowledge. "
Carl Sagan
Thinking
Way
Science
" 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