Fiction is obliged to stick to possibilities. Truth isn't.

When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong.

Failure is not fatal, but failure to change might be.

The second half of a man’s life is made up of nothing but the habits he has acquired during the first half.

Any man who afflicts the human race with ideas must be prepared to see them misunderstood.

Progress isn't made by early risers. It's made by lazy men trying to find easier ways to do something.

Choice is an illusion created between those with power and those withjout.

If you’re the smartest person in the room, you’re in the wrong room.

A man is what he thinks about all day long.