Space is what stops everything from happening in the same place.

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

Once you can reproduce a phenomenon, you are well on the way to understanding it.

In this single galaxy of ours there are eighty-seven thousand million suns. [...] In challenging it, you would be like ants attempting to label and classify all the grains of sand in all the deserts of the world. [...] It is a bitter thought, but you must face it. The planets you may one day possess. But the stars are not for man.

Magic's just science that we don't understand yet.

A well-stocked mind is safe from boredom.

I have a fantasy where Ted Turner is elected President but refuses because he doesn't want to give up power.