Ninety percent of everything is crap.
Basically, fiction is people. You can't write fiction about ideas.
You must write to the people's expertise.
Inner space is so much more interesting, because outer space is so empty.
Anybody can do anything he wants to if he wants to do it badly enough.
I've always written very tightly, and there's a good reason for that. There's no point in using words that you're not going to apply.