What counts can't always be counted; what can be counted doesn't always count.
Figuring out how to think about the problem.
Compound interest on debt was the banker's greatest invention, to capture, and enslave, a productive society.
The faster you go, the shorter you are.
Never memorize something that you can look up.
Put your hand on a hot stove for a minute and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute.