“I've heard an idea proposed, I've no idea how seriously, to account for the sensation of vertigo. It's an idea that I instinctively like and it goes like this. The dizzy sensation we experience when standing in high places is not simply a fear of falling. It's often the case that the only thing likely to make us fall is the actual dizziness itself, so it is, at best, an extremely irrational, even self-fulfilling fear. However, in the distant past of our evolutionary journey toward our current state, we lived in trees. We leapt from tree to tree. There are even those who speculate that we may have something birdlike in our ancestral line. In which case, there may be some part of our mind that, when confronted with a void, expects to be able to leap out into it and even urges us to do so. So what you end up with is a conflict between a primitive, atavistic part of your mind which is saying "Jump!" and the more modern, rational part of your mind which is saying, "For Christ's sake, don't!" In fact, vertigo is explained by some not as the fear of falling, but as the temptation to jump!”

“Experiencing grief and pain is like falling off a cliff. Everything has been turned upside down, and we are no longer in control. As we fall, we see one and only one tree that is growing out from the rock face. So we grab hold of it and cling to it with all our might. This tree is our holy God. He alone can keep us from falling headfirst to our doom. There simply aren’t any other trees to grab. So we cling to this tree (the holy God) with all our might.But what we didn’t realize is that when we fell and grabbed the tree our arm actually became entangled in the branches, so that in reality, the tree is holding us. We hold on to keep from falling, but what we don’t realize is that we can’t fall because the tree has us. We are safe. God, in his holiness, is keeping us and showing mercy to us. We may not be aware of it, but it is true. He is with us even in the deepest and darkest pit.”

“Anyone whose goal is 'something higher' must expect someday to suffer vertigo. What is vertigo? Fear of falling? No, Vertigo is something other than fear of falling. It is the voice of the emptiness below us which tempts and lures us, it is the desire to fall, against which, terrified, we defend ourselves.”

“There is no "tropical island paradise" I know of which remotely matches up to the fantasy ideal that such a phrase is meant to conjure up, or even to what we find described in holiday brochures. It's natural to put this down to the discrepancy we are all used to finding between what advertisers promise and what the real world delivers. It doesn't surprise us much any more. So it can come as a shock to realise that the world we hear described by travellers of previous centuries (or even previous decades) and biologists of today really did exist. The state it's in now is only the result of what we've done to it, and the mildness of the disappointment we feel when we arrive somewhere and find that it's a bit tatty is only a measure of how far our own expectations have been degraded and how little we understand what we've lost. The people who do understand what we've lost are the ones who are rushing around in a frenzy trying to save the bits that are left.”

“It is most gratifying," it said, "that your enthusiasm for our planet continues unabated, and so we would like to assure you that the guided missiles currently converging with your ship are part of a special service we extend to all of our most enthusiastic clients, and the fully armed nuclear warheads are of course merely a courtesy detail. We look forward to your custom in future lives ... thank you.”

“What was the Sherlock Holmes principle? ‘Once you have discounted the impossible, then whatever remains, however improbable, must be the truth.’ ” “I reject that entirely,” said Dirk sharply. “The impossible often has a kind of integrity to it which the merely improbably lacks. How often have you been presented with an apparently rational explanation of something that works in all respects other than one, which is that it is hopelessly improbable?...The first idea merely supposes that there is something we don’t know about, and...there are enough of those. The second, however, runs contrary to something fundamental and human which we do know about. We should therefore be very suspicious of it and all its specious rationality.”

“Religion... has certain ideas at the heart of it which we call sacred or holy or whatever... If someone votes for a party that you don't agree with, you're free to argue about it as much as you like; everybody will have an argument but nobody feels aggrieved by it. If somebody thinks taxes should go up or down you are free to have an argument about it. But on the other hand if somebody says 'I must [not] move a light switch on a Saturday', you say, 'I respect that'... Yet when you look at it rationally there is no reason why those ideas shouldn't be as open to debate as any other, except that we have agreed somehow between us that they shouldn't be.”