A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.
--Carl Sagan
Absence of evidence is not evidence of absence.
--Carl Sagan
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
Every thinking person fears nuclear war and every technological nation plans for it. Everyone knows it's madness, and every country has an excuse.
--Carl Sagan
Extraordinary claims require extraordinary evidence.
--Carl Sagan
For small creatures such as we the vastness is bearable only through love.
--Carl Sagan
History is full of people who out of fear or ignorance or the lust for power have destroyed treasures of immeasurable value which truly belong to all of us. We must not let it happen again.
--Carl Sagan
Human beings have a demonstrated talent for self-deception when their emotions are stirred.
--Carl Sagan
Humans are very good at dreaming, although you'd never know it from your television.
--Carl Sagan
I also wish that the Pledge of Allegiance were directed at the Constitution and the Bill of Rights, as it is when the President takes his oath of office, rather than to the flag and the nation.
--Carl Sagan
If we crave some cosmic purpose, then let us find ourselves a worthy goal.
--Carl Sagan
If we like them, they're freedom fighters... If we don't like them, they're terrorists. In the unlikely case we can't make up our minds, they're temporarily only guerrillas.
--Carl Sagan
If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the depth of our answers.
--Carl Sagan
If you wish to make an apple pie from scratch, you must first invent the universe.
--Carl Sagan
Imagination will often carry us to worlds that never were. But without it we go nowhere.
--Carl Sagan
It does no harm to the romance of the sunset to know a little bit about it.
--Carl Sagan
It is all a matter of time scale. An event that would be unthinkable in a hundred years may be inevitable in a hundred million.
--Carl Sagan
It is better to grasp the universe as it really is than to persist in delusion, however reassuring.
--Carl Sagan
Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgment, the manner in which information is collected and used.
--Carl Sagan
Modern science has been a voyage into the unknown, with a lesson in humility waiting at every stop. Many passengers would rather have stayed home.
--Carl Sagan
Nobody listens to mathematicians.
--Carl Sagan
One glance at a book and you hear the voice of another person, perhaps someone dead for 1,000 years. To read is to voyage through time.
--Carl Sagan
One of the saddest lessons of history is this: If we've been bamboozled long enough, we tend to reject any evidence of the bamboozle. We're no longer interested in finding out the truth. The bamboozle has captured us. it is simply too painful to acknowledge- even to ourselves- that we've been so credulous. (So the old bamboozles tend to persist as the new bamboozles rise.)
--Carl Sagan
Other things being equal, it is better to be smart than to be stupid.
--Carl Sagan
Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense.
--Carl Sagan
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
The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars.
--Carl Sagan
The suppression of uncomfortable ideas may be common in religion and politics, but it is not the path to knowledge; it has no place in the endeavor of science.
--Carl Sagan
The universe is not required to be in perfect harmony with human ambition.
--Carl Sagan
The universe seems neither benign nor hostile, merely indifferent.
--Carl Sagan
We are an intelligent species and the use of our intelligence quite properly gives us pleasure. In this respect the brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
--Carl Sagan
We are like butterflies who flutter for a day and think it is forever.
--Carl Sagan
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.
--Carl Sagan
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.
--Carl Sagan
Widespread intellectual and moral docility may be convenient for leaders in the short term, but it is suicidal for nations in the long term. One of the criteria for national leadership should therefore be a talent for understanding, encouraging, and making constructive use of vigorous criticism.
--Carl Sagan
You can't convince a believer of anything; for their belief is not based on evidence; it's based on a deep seated need to believe.
--Carl Sagan
You have to know the past to understand the present.
--Carl Sagan
Found 37 occurence(s) in 52,267 quotation(s).