Conceal your intensions. Keep people off balance and in the dark by never revealing the purpose behind your actions. If they have no clue what you are up to, they cannot prepare the defense. Guide them far enough down the wrong path, envelop them in enough smoke, and by the time they realize your intentions it will be too late.
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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 say something banal, it will seem original if you make it vague, open ended and sphinx-like.Powerfull people impress and intimidate by saying less. The more you say, the more likely you are to say something foolish.