New England Patriots' head coach Bill Belichick is regarded as one of the best leaders in the league.
Under his direction, the Patriots have made nine Super Bowl appearances , including this coming Sunday's game, and have taken home five Super Bowl rings. Belichick also is the fourth head coach in NFL history to reach at least 226 regular season wins .
To keep his team focused, Belichick relies on one key quote that he keeps posted where players can see it.
"The only sign we have in the locker room is from 'The Art of War.