Expectations are powerful. One thing that has been consistently true in my experience is that people you lead generally tend to meet your expectations, be they high or low.
If that is true, then what are you really expecting from those on your team? Mediocre results or outstanding results? Somehow, it seems that your true expectations of your people shows itself no matter how you try to disguise it.
So – expect great things of your team and you just might be surprised at how they rise up to meet those expectations.