We have made remarkable progress in the last hundred years, but if we want to continue, our future is in space.

Go the extra mile. It makes your boss look like an incompetent slacker.

I think the next [21st] century will be the century of complexity. We have already discovered the basic laws that govern matter and understand all the normal situations. We don't know how the laws fit together, and what happens under extreme conditions. But I expect we will find a complete unified theory sometime this century. The is no limit to the complexity that we can build using those basic laws.

It's clearly possible for a something to acquire higher intelligence than its ancestors: we evolved to be smarter than our ape-like ancestors, and Einstein was smarter than his parents.

When the going gets tough, the tough take a coffee break.

I've noticed that even people who believe in fate look both ways before crossing the street.

The wise never marry, and when they marry they become otherwise.