“Follow David’s example: say or do something that can be read in more than one way, that may be superficially polite but that could also indicate a slight coolness on your part or be seen as a subtle insult. A friend may wonder but will let it pass. The secret enemy, though, will react with anger.”

“Follow David’s example: say or do something that can be read in more than one way, that may be superficially polite but that could also indicate a slight coolness on your part or be seen as a subtle insult. A friend may wonder but will let it pass. The secret enemy, though, will react with anger.”

— Robert Greene