on Silence to Senseless Talk
   

"Some people like to expound their "senseless" theories, perhaps for as long as an hour. In such cases, say nothing, absolutely nothing... You should not discuss with these persons, even if your own silence gives them the false impression that they have convinced you... Otherwise, they may learn a few things about the truth, which they will distort and present it as it suits them. Whereas, when they don't know..."