Carl Sagan Quotes

Too much openness and you accept every notion, idea, and hypothesis-which is tantamount to knowing nothing. Too much skepticism-especially rejection of new ideas before they are adequately tested-and you're not only unpleasantly grumpy, but also closed to the advance of science. A judicious mix is what we need.

There is plenty of time to argue with new ideas later. They key is to take careful notes first and debate second.

If you are only skeptical, then no new ideas make it through to you.

Long experience has taught me this about the status of mankind with regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them, while on the other hand to know and understand a multitude of things renders men cautious in passing judgment upon anything new.

I believe in an open mind, but not so open that your brains fall out.

By all means let's be open-minded, but not so open-minded that our brains drop out.

Part of the scientific temperament is this tolerance for holding multiple hypotheses in mind at the same time.

Since opinions do not find in me a ready soil to thrust and spread their roots into, no premise shocks me, no belief hurts me, no matter how opposite to my own they may be.

The intellectual ... may live for ideas, as I have said, but something must prevent him from living for one idea, from becoming obsessive or grotesque. Although there have been zealots whom we may still regard as intellectuals, zealotry is a defect of the breed and not of the essence.

He that believes all misseth; he that believes nothing, hits not.

If you are only skeptical, then no new ideas make it through to you. You become a crotchety old person convinced that nonsense is ruling the world. (There is, of course, much data to support you.) But every now and then, a new idea turns out to be on the mark, valid and wonderful. If you are too much in the habit of being skeptical about everything, you are going to miss or resent it, and either way you will be standing in the way of understanding and progress.

I think the appropriate kind of skepticism is this: you've got to be asking questions all the time, you've also got to make sure that you're doing so in the spirit of genuinely wanting to find the answers - and that also means being open. I battle with this: I know I tend to be very skeptical and as a result, I veer towards the dismissive. But being aware of the tendency, I like to challenge my own skepticism and make sure it's not just knee-jerk. You need to be skeptical towards yourself as well. When you're only skeptical outwards you've got an unbalanced skepticism.

Science is much more than a body of knowledge. It is a way of thinking. This is central to its success. Science invites us to let the facts in, even when they don't conform to our preconceptions. It counsels us to carry alternative hypotheses in our heads and see which ones best match the facts. It urges on us a fine balance between no-holds-barred openness to new ideas, however heretical, and the most rigorous skeptical scrutiny of everything - new ideas and established wisdom.

Our belief is not a belief. Our principles are not a faith. We do not rely soley upon science and reason, because these are necessary rather than sufficient factors, but we distrust anything that contradicts science or outrages reason. We may differ on many things, but what we respect is free inquiry, openmindedness, and the pursuit of ideas for their own sake.

A skeptic as to all ideas, including especially my own, I have never suffered a pang when the ideas of some other imbecile prevailed.

The hardest part about gaining any new idea is sweeping out the false idea occupying that niche. As long as that niche is occupied, evidence and proof and logical demonstration get nowhere. But once the niche is emptied of the wrong idea that has been filling it:; once you can honestly say, "I don't know", then it becomes possible to get at the truth.

There are only two things one has to bear in mind. One has to be credulous - able to believe - and skeptical - able to not believe, because if you are not skeptical, you will believe rubbish. If you are not credulous you will learn nothing and the only way to balance those two is to recognize the mystery of things.

When we are in the grasp of illusion - or, for that matter, whenever we have a new idea - instead of searching for ways to prove our ideas wrong, we usually attempt to prove them correct. Psychologists call this the confirmation bias, and it presents a major impediment of our ability to break free from the misinterpretation of randomness.

We want to be open-minded enough to accept radial new ideas when they occasionally come along, but we don't want to be so open-minded that our brains fall out.

The plain fact is that education is itself a form of propaganda - a deliberate scheme to outfit the pupil, not with the capacity to weigh ideas, but with a simple appetite for gulping ideas ready-made. The aim is to make 'good' citizens, which is to say, docile and uninquisitive citizens.

Usually when we hear or read something new, we just compare it to our own ideas. If it is the same, we accept it and say that it is correct. If it is not, we say it is incorrect. In either case, we learn nothing.

In childhood our credulity serves us well. It helps us to pack, with extraordinary rapidity, our skulls full of the wisdom of our parents and our ancestors. But if we don't grow out of it in the fullness of time, our ... nature makes us a sitting target for astrologers, mediums, gurus, evangelists, and quacks. We need to replace the automatic credulity of childhood with the constructive skepticism of adult science.

A liberally educated person meets new ideas with curiosity and fascination. An illiberally educated person meets new ideas with fear.

The genuine rationalist does not think that he or anyone else is in possession of the truth; nor does he think that mere criticism as such helps us achieve new ideas. But he does think that, in the sphere of ideas, only critical discussion can help us sort the wheat from the chaff.

There is a distinct difference between having an open mind and having a hole in your head from which your brain leaks out.