We often thank of communication as what we say. Sometimes the art of coaching and teaching is learning when not to say anything. I loved this piece from the book "The Difference You Make" by Pat Williams. Williams talks about Chuck Daly sharing what he had learned as an assistant to Vic Bubas years earlier at Duke.
"Vic taught me to bite my tongue. He said, 'You have to know when to talk to players and when to keep your peace.' Vic taught me to always ask myself: 'Will this player benefit from what I say? Or will he just become less coachable?' Sometimes I would literally jam my knuckles in my mouth or look someplace else -- anything to keep from saying what I was thinking."