Wisdom of Talks and Silence

"Never start moving your own lips and teeth before the subordinates do. The longer I keep quiet, the sooner others move their lips and teeth. As they move their lips and teeth, I can thereby understand their real intentions.... If the sovereign is not mysterious, the ministers will find opportunity to take and take." 
~ Han-fei-tzu, Chinese philosopher, third century B.C.

There are times when it is unwise to be silent. Silence can arouse suspicion and even insecurity, especially in your superiors; a vague or ambiguous comment can open you up to interpretations you had not bargained for. Silence and saying less than necessary must be practiced with caution, then, and in the right situations. It is occasionally wiser to imitate the court jester, who plays the fool but knows he is smarter than the king. He talks and talks and entertains, and no one suspects that he is more than just a fool.

Also, words can sometimes act as a kind of smoke screen for any deception you might practice. By bending your listener’s ear with talk, you can distract and mesmerize them; the more you talk, in fact, the less suspicious of you they become. The verbose are not perceived as sly and manipulative but as helpless and unsophisticated. This is the reverse of the silent policy employed by the powerful: By talking more, and making yourself appear weaker and less intelligent than your mark, you can practice deception with greater ease.

Reference: THE 48 LAWS OF POWER by Robert Greene