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

“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.”

“Time,” said Arthur weakly, “is not currently one of my problems.”

“[The kakapo] is an extremely fat bird. A good-sized adult will weigh about six or seven pounds, and its wings are just about good for waggling a bit if it thinks it's about to trip over something — but flying is out of the question. Sadly, however, it seems that not only has the kakapo forgotten how to fly, but it has forgotten that it has forgotten how to fly. Apparently a seriously worried kakapo will sometimes run up a tree and jump out of it, whereupon it flies like a brick and lands in a graceless heap on the ground.”

“Another thing that got forgotten was the fact that against all probability a sperm whale had suddenly been called into existence several miles above the surface of an alien planet.And since this is not a naturally tenable position for a whale, this poor innocent creature had very little time to come to terms with its identity as a whale before it then had to come to terms with not being a whale any more.This is a complete record of its thoughts from the moment it began its life till the moment it ended it.Ah … ! What’s happening? it thought.Er, excuse me, who am I?Hello?Why am I here? What’s my purpose in life?What do I mean by who am I?Calm down, get a grip now … oh! this is an interesting sensation, what is it? It’s a sort of … yawning, tingling sensation in my … my … well I suppose I’d better start finding names for things if I want to make any headway in what for the sake of what I shall call an argument I shall call the world, so let’s call it my stomach.Good. Ooooh, it’s getting quite strong. And hey, what’s about this whistling roaring sound going past what I’m suddenly going to call my head? Perhaps I can call that … wind! Is that a good name? It’ll do … perhaps I can find a better name for it later when I’ve found out what it’s for. It must be something very important because there certainly seems to be a hell of a lot of it. Hey! What’s this thing? This … let’s call it a tail – yeah, tail. Hey! I can can really thrash it about pretty good can’t I? Wow! Wow! That feels great! Doesn’t seem to achieve very much but I’ll probably find out what it’s for later on. Now – have I built up any coherent picture of things yet?No.Never mind, hey, this is really exciting, so much to find out about, so much to look forward to, I’m quite dizzy with anticipation …Or is it the wind?There really is a lot of that now isn’t it?And wow! Hey! What’s this thing suddenly coming towards me very fast? Very very fast. So big and flat and round, it needs a big wide sounding name like … ow … ound … round … ground! That’s it! That’s a good name – ground!I wonder if it will be friends with me?And the rest, after a sudden wet thud, was silence.Curiously enough, the only thing that went through the mind of the bowl of petunias as it fell was Oh no, not again. Many people have speculated that if we knew exactly why the bowl of petunias had thought that we would know a lot more about the nature of the universe than we do now.”

“What to do if you find yourself stuck in a crack in the ground underneath a giant boulder you can't move, with no hope of rescue. Consider how lucky you are that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your current circumstances seems more likely, consider how lucky you are that it won't be troubling you much longer.”

“The lights were off so that his heads could avoid looking at each other because neither of them was currently a particular engaging sight, nor had they been since he had made the error of looking into his soul.It had indeed been an error.It had been late one night-- of course.It had been a difficult day-- of course.There had been soulful music playing on the ship's sound system-- of course.And he had, of course, been slightly drunk.In other words, all the usual conditions that bring on a bout of soul searching had applied, but it had, nevertheless, clearly been an error.”