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" 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. "

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" 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

" 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. "

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

" 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. "

" 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? "

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

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

" I am often amazed at how much more capability and enthusiasm for science there is among elementary school youngsters than among college students. "

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

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

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

" 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. "

" Imagination will often carry us to worlds that never were. But without it we go nowhere. "

Carl Sagan

Will

Never

" 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. "

" 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. "

" Absence of evidence is not evidence of absence. "

Carl Sagan

Evidence

Absence

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

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

" The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. "

" Most of the people that I deal with are human. So I've had a lot of experience with that. "

" I've written a number of books that have to do with the evolution of humans, human intelligence, human emotions. "

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

" 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. "

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

" 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? "

" 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

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

" 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. "