Keep Silent As Much As Possible
Be for the most part silent, or speak merely what is necessary, and in few words. - Epictetus
"Wise men speak because they have something to say. Fools because they have to say something." - Plato
From LOP-4: Always say less than necessary.
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The more you say, the more likely you are to say something foolish or revealing. Keeping your words measured and controlled gives you more power and keeps others guessing about your intentions and capabilities.
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Especially follow this when it when it comes to criticism see: HWFIP: Dont Condemn Criticize or Complain
The more you say, the more likely you are to say something foolish.