Twenty years ago while pursuing my undergraduate degree in Marketing / Advertising at Missouri State University, I had an extremely bright professor named Dr. Steven Greene for my Principles of Advertising class. If I remember anything from his class (one of my best), it's these two very important quotes:
"Zig when others zag."
"Creativity is measured at the cash register."
If you have any short, but powerful quotes that have taught you a lot about business...feel free to post them in the comments section.