Mother Nature doesn't care if you're having fun.

You learn by writing short stories. Keep writing short stories. The money's in novels, but writing short stories keeps your writing lean and pointed.

I've got five or six unpublished stories kicking around looking for somebody to buy them.

In hindsight it may even seem inevitable that a socialist society will starve when it runs out of capitalists.

Anything you don't understand is dangerous until you do understand it.

Building one space station for everyone was and is insane: we should have built a dozen.

Treat your life like something to be sculpted.