What lasts in the reader's mind is not the phrase but the effect the phrase created: laughter, tears, pain, joy. If the phrase is not affecting the reader, what's it doing there? Make it do its job or cut it without mercy or remorse.

Any planet is 'Earth' to those that live on it.

Today's science fiction is tomorrow's science fact.

Fertility is hereditary. If your parents didn't have any children, neither will you. I do not fear computers. I fear the lack of them.

Unfortunately, in many cases, people who write science fiction violate the laws of nature, not because they want to make a point, but because they don't know what the laws of nature are.

Fifty years," I hackneyed, "is a long time." "Not when you're looking back at them," she said. "You wonder how they vanished so quickly.

Naturally, there's got to be a limit for I don't expect to live forever, but I do intend to hang on as long as possible.