Always Say Less than Necessary
When you are trying to impress people with words, the more you say, the more common you appear, and the less in control. Even if you are saying something banal, it will seem original if you make it vague, open-ended, and sphinx-like. Powerful people impress and intimidate by saying less. The more you say, the more likely you are to say something foolish.
Culled from the Laws Of Power