Life is glorious when it is happy; days are carefree when they are happy; the interplay of thought and imagination is far superior to that of muscle and sinew.

It was obvious that bigotry was never a one-way operation, that hatred bred hatred!

I even got a letter from a young woman in British Columbia that began as follows: 'Today I am eighteen. I am sitting at the window, looking out at the rain, and thinking how much I love you.'

Science is a mechanism, a way of trying to improve your knowledge of nature. It's a system for testing your thoughts against the universe, and seeing whether they match.

If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster.

God, how that stings! I've spent a lifetime loving science fiction and now I find that you must expect nothing of something that's just science fiction.

The significant chemicals of living tissue are rickety and unstable, which is exactly what is needed for life.