Er zijn er vele meer, maar hier een steekproefje van goede en leuke skeptische citaten:

The beginning of wisdom is found in doubting; by doubting we come to the question, and by seeking we may come upon the truth.
--- Pierre Abelard

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.
---Isaac Asimov

We owe it to ourselves as respectable human beings, as thinking human beings, to do what we can to make humanity more rational. Humanists recognize that it is only when people feel free to think for themselves, using reason as their guide, that they are best capable of developing values that succeed in satisfying human needs and serving human interests.
--- Isaac Asimov 

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.
--- Isaac Asimov

Humanity has the stars in its future, and that future is too important to be lost under the burden of juvenile folly and ignorant superstition.

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'
 --- Isaac Asimov 

Creationists make it sound as though a 'theory' is something you dreamt up after being drunk all night.
--- Isaac Asimov

To surrender to ignorance and call it God has always been premature, and it remains premature today.
--- Isaac Asimov

If knowledge can create problems, it is not through ignorance that we can solve them.
--- Isaac Asimov

Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumoured by many. Do not believe in anything because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find anything that agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it.
--- Siddhartha Gautama (The Buddha), 563-483 B.C.

False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for everyone takes a salutory pleasure in proving their falseness; and when this is done, one path toward errors is closed and the road to truth is often at the same time opened.
--- Charles Darwin, The Descent of Man

Faith is the great cop-out, the great excuse to evade the need to think and evaluate evidence. Faith is belief in spite of, even perhaps because of, the lack of evidence.
--- Richard Dawkins

When two opposite points of view are expressed with equal intensity, the truth does not necessarily lie exactly between them. It is possible for one side to be simply wrong.
--- Richard Dawkins

Science is the study of the real world and the real word, whether we like it or not, is where we live.
--- Richard Dawkins

Today the theory of evolution is about as much open to doubt as the theory that the earth goes round the sun --- Richard Dawkins

Scientific beliefs are supported by evidence, and they get results. Myths and faiths are not and do not. --- Richard Dawkins

Reality is that which, when you stop believing in it, doesn't go away.
--- Philip K. Dick

It's not that I'm so smart, it's just that I stay with problems longer.
--- Albert Einstein

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
--- Albert Einstein

The further the spiritual evolution of mankind advances, the more certain it seems to me that the path to genuine religiosity does not lie through the fear of life, and the fear of death, and blind faith, but through striving after rational knowledge. --- Albert Einstein

It is easier to attribute UFO sightings to the known irrationalities of terrestrials than to the unknown efforts of extraterrestrials. --- Richard Feynmann

If a million people say a foolish thing, it is still a foolish thing. --- Anatole France

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.
--- Galileo Galilei

From now on we live in a world where man has walked on the Moon. It's not a miracle; we just decided to go.
--- Tom Hanks

Facts do not cease to exist because they are ignored. --- Aldous Huxley

Superstition is, always has been, and forever will be, the enemy of liberty.
--- Robert Green Ingersoll

Niets houdt de vooruitgang van de wetenschap zo tegen als wanneer men meent te weten wat men nog niet weet --- Georg Christoph Lichtenberg (1742-1799)

Faith may be defined briefly as an illogical belief in the occurrence of the improbable.
--- H.L. Mencken

Entia non sunt multiplicanda praeter necessitatem. --- William of Ockham, (gekend als het “Scheermes van Ockham”, klik hier)

De evolutietheorie is een empirische theorie met een overstelpende hoeveelheid materiaal die de theorie ondersteunt. Derhalve is het geen geloof. Voor het geloof daarentegen is er niet één empirisch argument aan te voeren. Niet één.
--- Herman Philipse

Science must begin with myth and with the criticism of myth.
--- Karl Popper

Those who promise us paradise on earth never produced anything but a hell.
--- Karl Popper

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.
--- Karl Popper

I don't know if God exists, but it would be better for His reputation if He didn't. --- Jules Renard

The idea of the sacred is quite simply one of the most conservative notions in any culture, because it seeks to turn other ideas --uncertainty, progress, change -- into crimes.
--- Salman Rushdie

What is wanted is not the will to believe, but the wish to find out, which is the exact opposite.
--- Bertrand Russell

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

A central lesson of science is that to understand complex issues (or even simple ones), we must try to free our minds of dogma and to guarantee the freedom to publish, to contradict, and to experiment. Arguments from authority are unacceptable.
--- Carl Sagan

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.
--- Carl Sagan

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

I would love to believe that when I die I will live again, that some thinking, feeling, remembering part of me will continue. But as much as I want to believe that, and despite the ancient and worldwide cultural traditions that assert an afterlife, I know of nothing to suggest that it is more than wishful thinking.
--- Carl Sagan

If you want to make an apple pie from scratch, you must first create the universe.
--- Carl Sagan

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

There are many hypotheses in science which are wrong. That's perfectly all right; they're the aperture to finding out what's right. Science is a self-correcting process. To be accepted, new ideas must survive the most rigorous standards of evidence and scrutiny.
--- Carl Sagan

Think of how many religions attempt to validate themselves with prophecy. Think of how many people rely on these prophecies, however vague, however unfulfilled, to support or prop up their beliefs. Yet has there ever been a religion with the prophetic accuracy and reliability of science?
--- Carl Sagan

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

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

In order to make an apple pie from scratch, you must first create the universe.
--- Carl Sagan

There are many hypotheses in science which are wrong. That's perfectly all right; they're the aperture to finding out what's right. Science is a self-correcting process. To be accepted, new ideas must survive the most rigorous standards of evidence and scrutiny.
--- Carl Sagan

There is no other species on Earth that does science. It is, so far, entirely a human invention, evolved by natural selection in the cerebral cortex for one simple reason: it works. It is not perfect. It can be misused. It is only a tool. But it is by far the best tool we have, self-correcting, ongoing, applicable to everything. --- Carl Sagan

(Science) has two rules. First: there are no sacred truths; all assumptions must be critically examined; arguments from authority are worthless. Second: whatever is inconsistent with the facts must be discarded or revised. We must understand the Cosmos as it is and not confuse how it is with how we wish it to be. --- Carl Sagan

The method of science is tried and true. It is not perfect, it's just the best we have. And to abandon it, with it's skeptical protocols is the pathway to a dark age.
--- Carl Sagan

It is sad that while science moves ahead in exciting new areas of research, fine-tuning our knowledge of how life originated and evolved, creationists remain mired in medieval debates about angels on the head of a pin and animals in the belly of an Ark.
--- Michael Shermer

And what if we picked the wrong religion?  Every week, we're just making
God madder and madder! --- Homer Simpsons, ``Homer the Heretic'', The Simpsons

He alone is free who lives with free consent under the entire guidance of reason.
--- Spinoza

Science is organised knowledge. --- Herbert Spencer.

A man is accepted into church for what he believes - and turned out for what he knows.
--- Mark Twain

Beliefs are what divide people. Doubt unites them. --- Peter Ustinov

As long as people believe in absurdities they will continue to commit atrocities.
--- Voltaire

Ubi dubium ibi libertas.
Where there is doubt, there is freedom.
--- Anonymous (Latin Proverb)

God has no place within this school walls just as facts have no place within organized religion.
--- Superintendent Chalmers in The Simpsons