“Immortality,' said Crake, ' is a concept. If you take 'mortality' as being, not death, but the foreknowledge of it and the fear of it, then 'immortality' is the absence of such fear. Babies are immortal. Edit out the fear, and you'll be...”

“Why are you so interested in amoebas?""Oh, they're immortal," he said, "and sort of shapeless and flexible. Being aperson is getting too complicated.”

“We immortals aren't misers - we don't hoard! Such things are pointless.”

“Glenn used to say the reason you can't really imagine yourself being dead was that as soon as you say, 'I'll be dead,' you've said the word I, and so you're still alive inside the sentence. And that's how people got the idea of the immortality of the soul - it was a consequence of grammar.”

“Writing of the narrative kind, and perhaps all writing, is motivated deep down, by a fear or and fascination with mortality - by a desire to make the risky trip to the underworld and to bring something or someone back from the dead. ”

“…Homo sapiens doesn’t seem able to cut himself off at the supply end. He’s one of the few species that doesn’t limit reproduction in the face of dwindling resources. In other words - and up to a point, of course - the less we eat, the more we fuck.’‘How do you account for that?’ said Jimmy.‘Imagination,’ said Crake, ‘Men can imagine their own deaths, they can see them coming, and the mere thought of impending death acts like an aphrodisiac. A dog or a rabbit doesn’t behave like that. Take birds - in a lean season they cut down on the eggs, or they don’t mate at all. They put their energy into staying alive themselves until times get better. But human beings hope they can stick their souls into someone else, some new version of themselves, and live on forever.’‘As a species we’re doomed by hope then?’ ‘You could call it hope. That, or desperation.’ ‘But we’re doomed without hope, as well,’ said Jimmy.‘Only as individuals,’ said Crake cheerfully.‘Well, it sucks.’‘Jimmy, grow up.’Crake wasn’t the first person who ever said that to Jimmy.”

“Those walls and bars are there for a reason,' said Crake. ' Not to keep us out, but to keep them in. Mankind needs barriers in both cases”