(Excerpt from Extreme Leadership by Jocko Willink and Leif Babin)
… they must recognize that when it comes to standards, as a leader, it’s not what you preach, it’s what you tolerate. When setting expectations, no matter what has been said or written, if substandard performance is accepted and no one is held accountable—if there are no consequences—that poor performance becomes the new standard. Therefore, leaders must enforce standards. Consequences for failing need not be immediately severe, but leaders must ensure that tasks are repeated until the higher expected standard is achieved.