“I refuse to answer that question on the grounds that I don't know the answer”

“Why?' is always the most difficult question to answer. You know where you are when someone asks you 'What's the time?' or 'When was the battle of 1066?' or 'How do these seatbelts work that go tight when you slam the brakes on, Daddy?' The answers are easy and are, respectively, 'Seven-thirty in the evening,' 'Ten-fifteen in the morning,' and 'Don't ask stupid questions.”

“Exactly!" said Deep Thought. "So once you do know what the question actually is, you'll know what the answer means.”

“Sometimes if you received an answer, the question might be taken away.”

“The Answer to the Great Question... Of Life, the Universe and Everything... Is... Forty-two,' said Deep Thought, with infinite majesty and calm.”

“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.”

“O Deep Thought computer," he said, "the task we have designed you to perform is this. We want you to tell us...." he paused, "The Answer.""The Answer?" said Deep Thought. "The Answer to what?""Life!" urged Fook."The Universe!" said Lunkwill."Everything!" they said in chorus.Deep Thought paused for a moment's reflection."Tricky," he said finally."But can you do it?"Again, a significant pause."Yes," said Deep Thought, "I can do it.""There is an answer?" said Fook with breathless excitement."Yes," said Deep Thought. "Life, the Universe, and Everything. There is an answer. But, I'll have to think about it."...Fook glanced impatiently at his watch.“How long?” he said.“Seven and a half million years,” said Deep Thought.Lunkwill and Fook blinked at each other.“Seven and a half million years...!” they cried in chorus.“Yes,” declaimed Deep Thought, “I said I’d have to think about it, didn’t I?"[Seven and a half million years later.... Fook and Lunkwill are long gone, but their descendents continue what they started]"We are the ones who will hear," said Phouchg, "the answer to the great question of Life....!""The Universe...!" said Loonquawl."And Everything...!""Shhh," said Loonquawl with a slight gesture. "I think Deep Thought is preparing to speak!"There was a moment's expectant pause while panels slowly came to life on the front of the console. Lights flashed on and off experimentally and settled down into a businesslike pattern. A soft low hum came from the communication channel."Good Morning," said Deep Thought at last."Er..good morning, O Deep Thought" said Loonquawl nervously, "do you have...er, that is...""An Answer for you?" interrupted Deep Thought majestically. "Yes, I have."The two men shivered with expectancy. Their waiting had not been in vain."There really is one?" breathed Phouchg."There really is one," confirmed Deep Thought."To Everything? To the great Question of Life, the Universe and everything?""Yes."Both of the men had been trained for this moment, their lives had been a preparation for it, they had been selected at birth as those who would witness the answer, but even so they found themselves gasping and squirming like excited children."And you're ready to give it to us?" urged Loonsuawl."I am.""Now?""Now," said Deep Thought.They both licked their dry lips."Though I don't think," added Deep Thought. "that you're going to like it.""Doesn't matter!" said Phouchg. "We must know it! Now!""Now?" inquired Deep Thought."Yes! Now...""All right," said the computer, and settled into silence again. The two men fidgeted. The tension was unbearable."You're really not going to like it," observed Deep Thought."Tell us!""All right," said Deep Thought. "The Answer to the Great Question...""Yes..!""Of Life, the Universe and Everything..." said Deep Thought."Yes...!""Is..." said Deep Thought, and paused."Yes...!""Is...""Yes...!!!...?""Forty-two," said Deep Thought, with infinite majesty and calm.”