No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.

It's the writing that teaches you.

There are no nations! There is only humanity. And if we don't come to understand that right soon, there will be no nations, because there will be no humanity.

It has always been my ambition to die in harness with my head face down on a keyboard and my nose caught between two of the keys.

Experimentation is the least arrogant method of gaining knowledge. The experimenter humbly asks a question of nature.

An atom-blaster is a good weapon, but it can point both ways.

I have never written a book that didn't teach me far more than it taught my reader.