Saying...Less

Speaking less will make people reveal more about themselves. This is information you may be able to use against them later on. Your short answers and silences will put them on the defensive, and they will jump in, nervously filling the silence with all kinds of comments that will reveal valuable information about them and their weaknesses. The longer you listen, the more others move their lips and teeth. As they move their lips and teeth, you can thereby understand their real intentions.

Speaking Less will force people to listen/interpret your every word carefully. Your silence will make other people uncomfortable. Humans are machines of interpretation and explanation; they wish or have to know what you are thinking. When you carefully control what you reveal, they cannot pierce your intentions or your meaning. They will leave a meeting with and they will go home and ponder your every word. This extra attention to your brief comments will only add to your power.

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 and open-ended.