In like manner, if I let myself believe anything on insufficient evidence, there may be no great harm done by the mere belief; it may be true after all, or I may never have occasion to exhibit it in outward acts. But I cannot help doing this great wrong towards Man, that I make myself credulous. The danger to society is not merely that it should believe wrong things, though that is great enough; but that it should become credulous, and lose the habit of testing things and inquiring into them; for then it must sink back into savagery.

Shakespeare 'never owned a book,' a writer for the New York Times gravely informed readers in one doubting article in 2002. The statement cannot actually be refuted, for we know nothing about his incidental possessions. But the writer might just as well have suggested that Shakespeare never owned a pair of shoes or pants. For all the evidence tells us, he spent his life naked from the waist down, as well as bookless, but it is probably that what is lacking is the evidence, not the apparel or the books.

It does appear that some parts of our evolutionary process seem inevitable. It is striking that throughout evolutionary history, the eye evolved independently fifty to a hundred times. This is strong evidence for the fact that the different rolls of the dice that have occurred across different species seem to have produced species with eyes regardless of what is going on around them. Lots of other examples illustrate how some features, if they are advantageous, seem to rise to the top of the evolutionary swamp. This is illustrated every time you see the same feature appearing more than once in different parts of the animal kingdom. Dolphins and bats, for example, use echolocation, but they evolved this trait independently at very different points on the evolutionary tree.

The most preposterous notion that Homo sapiens has ever dreamed up is that the Lord God of Creation, Shaper and Ruler of all the Universes, wants the saccharine adoration of His creatures, can be swayed by their prayers, and becomes petulant if He does not receive this flattery. Yet this absurd fantasy, without a shred of evidence to bolster it, pays all the expenses of the oldest, largest, and least productive industry in all history.

The evidence which we have of the great facts of the Bible history belongs to this class, that is, it is moral evidence; sufficient to satisfy any rational mind, by carrying it to the highest degree of moral certainty. If such evidence well justify the taking away of human life or liberty, in the one case, surely it ought to be deemed sufficient to determine our faith in the other.

But the Christian writer seems, by the usual course of the argument, to have been deprived of the common presumption of charity in his favor; and reversing the ordinary rule of administering justice in human tribunals, his testimony is unjustly presumed to be false, until it is proved to be true. ...{independent historians} have been treated, in the argument, almost as if the New Testament were the entire production, at once, of a body of men, conspiring by a joint fabrication, to impose a false religion upon the world.

I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.

It's natural to think that living things must be the handiwork of a designer. But it was also natural to think that the sun went around the earth. Overcoming naive impressions to figure out how things really work is one of humanity's highest cal

Claims that cannot be tested, assertions immune to disproof are veridically worthless, whatever value the may have in inspiring us or in exciting our sense of wonder.

It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are based on evidence, not on authority or intuition.

Mere lack of evidence, of course, is no reason to denounce a theory. Look at intelligent design. The fact that it is bollocks hasn't stopped a good many people from believing in it. Darwinism itself is only supported by tons of evidence, which is a clear indication that Darwin didn't write his books himself.

Science replaces private prejudice with public, verifiable evidence.

Evidence is always partial. Facts are not truth, though they are part of it – information is not knowledge. And history is not the past – it is the method we have evolved of organising our ignorance of the past. It's the record of what's left on the record. It's the plan of the positions taken, when we to stop the dance to note them down. It's what's left in the sieve when the centuries have run through it – a few stones, scraps of writing, scraps of cloth. It is no more —the past— than a birth certificate is a birth, or a script is a performance, or a map is a journey. It is the multiplication of the evidence of fallible and biased witnesses, combined with incomplete accounts of actions not fully understood by the people who performed them. It's no more than the best we can do, and often it falls short of that.

My main reason for scepticism about the Huxley/Sagan theory is that the human brain is demonstrably eager to see faces in random patterns, as we know from scientific evidence, on top of the numerous legends about faces of Jesus, or the Virgin Mary, or Mother Teresa, being seen on slices of toast, or pizzas, or patches of damp on a wall. This eagerness is enhanced if the pattern departs from randomness in the specific direction of being symmetrical.

...and when is enough proof enough?

Extraordinary claims require extraordinary evidence.

Don't you believe in flying saucers, they ask me? Don't you believe in telepathy? — in ancient astronauts? — in the Bermuda triangle? — in life after death?No, I reply. No, no, no, no, and again no.One person recently, goaded into desperation by the litany of unrelieved negation, burst out Don't you believe in anything?Yes, I said. I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.

All of these teeth had once been in real, live people. They had talked and smiled and eaten and sang and cursed and prayed. They had brushed and flossed and died. In English class, we read poems about death, but here, right in front of me was a poem about death too.

I'm frequently asked, Do you believe there's extraterrestrial intelligence? I give the standard arguments- there are a lot of places out there, the molecules of life are everywhere, I use the word billions, and so on. Then I say it would be astonishing to me if there weren't extraterrestrial intelligence, but of course there is as yet no compelling evidence for it.Often, I'm asked next, What do you really think?I say, I just told you what I really think.Yes, but what's your gut feeling?But I try not to think with my gut. If I'm serious about understanding the world, thinking with anything besides my brain, as tempting as that might be, is likely to get me into trouble. Really, it's okay to reserve judgment until the evidence is in.

I couldn't care less about evidence and proof and assurances. I just want God. I want God inside me. I want God to play in my bloodstream the way sunlight amuses itself on water.