The idea that ancient equal years of accumulated wisdom is a fallacy. [...] In medicine, 'ancient' also means developed before we understood the causes of disease, before germ theory. It was based on ignorance then and age makes it no truer. We misguidedly look back to a golden age that never was; ours is the golden age of safe tested medicine, effective beyond placebo, in which we've cut infant mortality and conquered diseases, then forgotten they existed.

Yet scientists are required to back up their claims not with private feelings but with publicly checkable evidence. Their experiments must have rigorous controls to eliminate spurious effects. And statistical analysis eliminates the suspicion (or at least measures the likelihood) that the apparent effect might have happened by chance alone. Paranormal phenomena have a habit of going away whenever they are tested under rigorous conditions. This is why the £740,000 reward of James Randi, offered to anyone who can demonstrate a paranormal effect under proper scientific controls, is safe. Why don't the television editors insist on some equivalently rigorous test? Could it be that they believe the alleged paranormal powers would evaporate and bang go the ratings? Consider this. If a paranormalist could really give an unequivocal demonstration of telepathy (precognition, psychokinesis, reincarnation, whatever it is), he would be the discoverer of a totally new principle unknown to physical science. The discoverer of the new energy field that links mind to mind in telepathy, or of the new fundamental force that moves objects around a table top, deserves a Nobel prize and would probably get one. If you are in possession of this revolutionary secret of science, why not prove it and be hailed as the new Newton? Of course, we know the answer. You can't do it. You are a fake. Yet the final indictment against the television decision-makers is more profound and more serious. Their recent splurge of paranormalism debauches true science and undermines the efforts of their own excellent science departments. The universe is a strange and wondrous place. The truth is quite odd enough to need no help from pseudo-scientific charlatans. The public appetite for wonder can be fed, through the powerful medium of television, without compromising the principles of honesty and reason.

Gravity is not a version of the truth. It is the truth. Anyone who doubts it is invited to jump out a tenth-storey window.

Reason has built the modern world. It is a precious but also a fragile thing, which can be corroded by apparently harmless irrationality. We must favor verifiable evidence over private feeling. Otherwise we leave ourselves vulnerable to those who would obscure the truth.

It would be intolerant if I advocated the banning of religion, but of course I never have. I merely give robust expression to views about the cosmos and morality with which you happen to disagree. You interpret that as ‘intolerance’ because of the weirdly privileged status of religion, which expects to get a free ride and not have to defend itself. If I wrote a book called The Socialist Delusion or The Monetarist Delusion, you would never use a word like intolerance. But The God Delusion sounds automatically intolerant. Why? What’s the difference? I have a (you might say fanatical) desire for people to use their own minds and make their own choices, based upon publicly available evidence. Religious fanatics want people to switch off their own minds, ignore the evidence, and blindly follow a holy book based upon private ‘revelation’. There is a huge difference.

I have found it an amusing strategy, when asked whether I am an atheist, to point out that the questioner is also an atheist when considering Zeus, Apollo, Amon Ra, Mithras, Baal, Thor, Wotan, the Golden Calf and the Flying Spaghetti Monster. I just go one god further.

More generally it is completely unrealistic to claim, as Gould and many others do, that religion keeps itself away from science's turf, restricting itself to morals and values. A universe with a supernatural presence would be a fundamentally and qualitatively different kind of universe from one without. The difference is, inescapably, a scientific difference. Religions make existence claims, and this means scientific claims.

When I am dying, I should like my life taken out under general anaesthetic, exactly as if it were a diseased appendix.

Religion teaches you to be satisfied with nonanswers. It’s a sort of crime against childhood.

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The patient typically finds himself impelled by some deep, inner conviction that something is true, or right, or virtuous: a conviction that doesn't seem to owe anything to evidence or reason, but which, nevertheless, he feels as totally compelling and convincing. We doctors refer to such a belief as "faith".

I was reminded of a quotation by the famous American physicist Steven Weinberg, Nobel Prize-winning theoretical physicist. Weinberg said: "Religion is an insult to human dignity. Without it, you'd have good people doing good things, and evil people doing evil things. But for good people to do evil things, it takes religion". (Part 2, 00:35:01)