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" 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? "

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" 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

" When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it. "

" We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. "

" 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. "

" 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. "

" We're in very bad trouble if we don't understand the planet we're trying to save. "

" Science is a way of thinking much more than it is a body of knowledge. "

" Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense. "

" 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. "

" 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. "

" The universe seems neither benign nor hostile, merely indifferent. "

" We've arranged a civilization in which most crucial elements profoundly depend on science and technology. "

" 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. "

" Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. "

" 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. "

" 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. "

" We are not without empathetic terror when we open Pascal's 'Pensees' and read, 'I am the great silent spaces between worlds.' "

" If you wish to make an apple pie from scratch, you must first invent the universe. "

" 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. "

" The Earth is a very small stage in a vast cosmic arena. "

" Absence of evidence is not evidence of absence. "

Carl Sagan

Evidence

Absence

" 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

Save

" A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism. "

" It's been said that astronomy is a humbling and, I might add, a character-building experience. "

" 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? "

" It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring. "

" The universe is not required to be in perfect harmony with human ambition. "

" 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. "

" 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! "

" 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. "