Face reality as it is, not as it was or as you wish it to be.
The most important quality of leadership is intellectual honesty. The reality principle - the ability to see the world as it really is, not as you wish it were.
You can't believe how hard it is for people to be simple, how much they fear being simple. They worry that if they're simple, people will think they're simpleminded. In reality, of course, it's just the reverse. Clear, tough-minded people are the most simple.
Face reality as it is, not as it was, or as you wish it were. Be candid with everyone. Don't manage, lead. Change before you have to. If you don't have a competitive advantage, don't compete. Control your own destiny, or someone else will.
Trying to get people to face reality and see the world the way it really is is an absolutely critical aspect of leadership, in my view.