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" 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! "

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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

" 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

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

" 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. "

" 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. "

" 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? "

" 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. "

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

" For small creatures such as we the vastness is bearable only through love. "

" 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. "

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

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

" The boundary between space and the earth is purely arbitrary. And I'll probably always be interested in this planet - it's my favorite. "

" 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. "

" Absence of evidence is not evidence of absence. "

Carl Sagan

Evidence

Absence

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

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

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

" 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? "

" 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. "

" 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. "

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

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

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

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

" 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. "

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

" Extinction is the rule. Survival is the exception. "

" 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. "