“How can I tell," said the man, "that the past isn't a fiction designed to account for the discrepancy between my immediate physical sensations and my state of mind?”

“A beach house isn't just real estate. It's a state of mind.”

“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!”

“What, are you, crazy?' 'It's a possibility I haven't ruled out yet', said Zaphod quietly. 'I know as much about myself as my mind can work out under its current conditions. And its current conditions are not good.”

“I remembered once, in Japan, having been to see the Gold Pavilion Temple in Kyoto and being mildly surprised at quite how well it had weathered the passage of time since it was first built in the fourteenth century. I was told it hadn’t weathered well at all, and had in fact been burnt to the ground twice in this century. “So it isn’t the original building?” I had asked my Japanese guide.“But yes, of course it is,” he insisted, rather surprised at my question.“But it’s burnt down?”“Yes.”“Twice.”“Many times.”“And rebuilt.”“Of course. It is an important and historic building.”“With completely new materials.”“But of course. It was burnt down.”“So how can it be the same building?”“It is always the same building.”I had to admit to myself that this was in fact a perfectly rational point of view, it merely started from an unexpected premise. The idea of the building, the intention of it, its design, are all immutable and are the essence of the building. The intention of the original builders is what survives. The wood of which the design is constructed decays and is replaced when necessary. To be overly concerned with the original materials, which are merely sentimental souvenirs of the past, is to fail to see the living building itself.”

“I only know as much about myself as my mind can work out under its current conditions. And its current conditions are not good.”

“You know," said Arthur, "it's at times like this, when I'm trapped in a Vogon airlock with a man from Betelgeuse, and about to die of asphyxiation in deep space that I really wish I'd listened to what my mother told me when I was young.""Why, what did she tell you?""I don't know, I didn't listen.”