Integrity Or Bust

"You're looking for three things, generally, in a person. Intelligence, energy, and integrity. And if they don't have the last one, don't even bother with the first two." - Warren Buffett

What is integrity? I like the definition "doing what you say you will do." It's truthfulness between words and actions. There could be other elements I suppose, like being virtuous in values. But at its heart, integrity nurtures trust, which exponentially increases success as a team or as an individual.