If we have learned one thing from the history of invention and discovery, it is that, in the long run-and often in the short one-the most daring prophecies seem laughably conservative.

All human plans [are] subject to ruthless revision by Nature, or Fate, or whatever one preferred to call the powers behind the Universe.

I believe any malevolent supercivilisation would have rapidly self-destructed as we may be in the process of doing ourselves. If we do have contact, physical contact with aliens, I think it will be benign.

I want to be remembered most as a writer - one who entertained readers, and, hopefully, stretched their imagination as well.

If children have interests, then education happens.

It was the mark of a barbarian to destroy something one could not understand.

Our own grandchildren may demonstrate that-sometimes- Gigantic is Beautiful.