Charles Sheffield Quotes

Mathematics is universal. But very little else is.

But mere plausibility did not make the statement true.

But humans had to learn to ignore appearance. No two beings who shared common thinking processes and common goals should be truly alien to each other.

And now I think about it, I never really wanted to live forever. I just want to live well.

A long time ago humans talked of terraforming Mars and Venus, but we never did it. Just too busy blowing ourselves up, I guess, ever to get round to it.

I've been testing Kallen's Law—my name for it, not his. Remember what he said? 'Anything that can be put into a data bank by one person can be taken out of it by another, if you're smart enough and have enough time.' That's one problem with a computer-based society, and one reason why computers were so tightly controlled on Pentecost: it's almost impossible to prevent access to computer-stored information.

It is my personal belief that nothing can exceed light speed," said Sy at last. "I will mistrust anyone, government or Immortal, man or woman, human or alien, who attempts to tell me otherwise without providing convincing evidence.

Where orbits are wildly varying, life has no chance to develop. Changes are too extreme. Temperatures melt tin, then solidify nitrogen. If it is once established, life is persistent; it can adapt to many extremes. But there is a fragility in the original creation that calls for a long period of tightly-controlled variations.

My aunt doesn't even believe there is a Ship. She says we've been here on Pentecost forever."
"What did you tell her?"
"Nothing. For someone with that view, logic is irrelevant—she'll believe what she chooses, regardless of evidence. Her religion says God placed us here on Pentecost, and for her that's the end of the argument."
"And you?" Peron was aware that she had moved in very close to him. "What do you think?"
"You know what I think. I'm cursed with a logical mind, and a lot of curiosity.

Earth has been regarded for centuries as a giant self-regulating machine, absorbing all changes, great and small, and diluting their effects until they become invisible on a global scale. Mankind has taken that stability for granted. Careless of consequences, we have watched as forests were cleared, lakes poisoned, rivers dammed and diverted, mountains leveled, whole plains dug out for their mineral and fuel content. And nothing disastrous happened. Earth tolerated the insults, and always she restored the status quo.
Always—until now. Until finally some hidden critical point has been passed. The move away from a steady state is signalled in many ways: by increasing ocean temperatures, by drought and flood, by widespread loss of topsoil, by massive crop failure, and by the collapse of worldwide fishing industries.

Lop the top-end tail off the distribution of human intelligence and creativity," he went on, "and it would make no measurable difference to the population. Only one person in a billion is out beyond the six-sigma level. That's what we're talking about here. But eventually those one-in-a-billion make a huge difference. Ninety-five percent of all human progress comes from less than one thousandth of one percent of the population.

It sounds reasonable to me."
"Reasonable, but not true. Big difference.

See, everybody looks at the world from his own point of view. I call it the ground state of the resting mind. And your brain does the same thing, left alone it returns to and thinks about what it’s really interested in.

Sometimes wealth and power merely created the desire for more of the same.

Not it. He. Bey was sure he would have determined that for himself after a few more seconds. There were a hundred clues as to the innate sex of a form, and most of them had nothing to do with appearance or dress.