Boredom is my worst enemy. It's killed a lot of my friends, but it won't get me. When I get bored, I go risk my life somewhere.

In the world of words the imagination is one of the forces of nature.

In challenging a kzin, a simple scream of rage is sufficient. You scream and you leap.

I never got good at predicting what millions of people will suddenly decide is rational.

Boredom is my worst enemy. It's killed a lot of my friends, but it won't get me. When I get bored, I go risk my life somewhere.

There were timelines branching and branching, a mega-universe of universes, millions more every minute. Billions? Trillions? The universe split every time someone made a decision. Split, so that every decision ever made could go both ways. Every choice made by every man, woman, and child was reversed in the universe next door.

The best advice I was ever given was on my twenty-first birthday when my father said, Son, here's a million dollars. Don't lose it.