The secret of the universe is this: The universe doesn't care. That part of the job is yours.

To say that a writer's hold on reality is tenuous is an understatement-it's like saying the Titanic had a rough crossing. Writer's build their own realities, move into them and occasionally send letters home. The only difference between a writer and a crazy person is that a writer gets paid for it.

Who are we? And to me that's the essential question that's always been in science fiction. A lot of science fiction stories are - at their very best - evocations of that question. When we look up at the night sky and wonder, "Is there anyone else out there?" we're also asking who we are we in relation to them.

What I wish is that people would look beyond the tribbles and see I've written some other books that I really would like people to notice. There's The Man Who Folded Himself, there's The Martian Child, which is about my son and the adoption. There's The War Against The Chtorr, which is my magnum opus, my great epic story.

Adolescence is that time in your life when you discover your ability to be depressed.

Morality—like velocity—is relative. The determination of it depends on what the objects around you are doing. All one can do is measure one's position in relation to them; never can one measure one's velocity or morality in terms of absolutes.

Tomorrow is going to be different than yesterday, it's going to be a lot different.