TEACHING IS MOVING PAST FAILURE

You have to teach your players certain things that they will learn, or not learn, at differing rates of success.  And you will have someone who seems to have a terribly difficult time understanding or perfecting what it is you want him to do.  But before you give up on that individual, before you stop what it is you're trying to teach him, you have to understand that you're both going to experience a period of failure. There is a tendency today among some coaches to give up too soon.  The trend toward specialization is an example of that.  You don't have to ask a player to improve overall; you simply assign him a specific task in a system and that's all he has to do.

From "The Smart Take From The Strong" by Pete Carril