“[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.”

“The kakapo is a bird out of time. If you look one in its large, round, greeny-brown face, it has a look of serenely innocent incomprehension that makes you want to hug it and tell it that everything will be all right, thought you know that it probably will not be.”

“The Guide says there is an art to flying", said Ford, "or rather a knack. The knack lies in learning how to throw yourself at the ground and miss.”

“In the stillness, a fly would not have dared clear it's throat.”

“Zaphod left the controls for Ford to figure out, and lurched over to Arthur."Look, Earthman," he said angrily, "you've got a job to do, right? The Question to the Ultimate Answer, right?""What, that thing?" said Arthur, "I thought we'd forgotten about that.""Not me, baby. Like the mice said, it's worth a lot of money in the right quarters. And it's all locked up in that head thing of yours.""Yes but ...""But nothing! Think about it. The Meaning of Life! We get our fingers on that we can hold every shrink in the Galaxy up to ransom, and that's worth a bundle. I owe mine a mint."Arthur took a deep breath without much enthusiasm."Alright," he said, "but where do we start? How should I know? They say the Ultimate Answer or whatever is Forty-two, how am I supposed to know what the question is? It could be anything. I mean, what's six times seven?"Zaphod looked at him hard for a moment. Then his eyes blazed with excitement."Forty-two!" he cried.Arthur wiped his palm across his forehead."Yes," he said patiently, "I know that."Zaphod's faces fell."I'm just saying that the question could be anything at all," said Arthur, "and I don't see how I am meant to know.”

“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.”

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