Trust. The foundation of any relationship, whether personal or professional. It's also one of the easiest things to break and one of the hardest things to rebuild.
I'm a big believer that you have to hire the right people, set the right expectations, provide them an environment where they can be successful, help them get 1% better each day, and hold them accountable. But then you have to trust them to do their job and that they will be successful. You have to get out of their way, let them make and learn from mistakes, coach, and support them.
If you are lacking trust, look in the mirror and honestly ask yourself if you have really created an environment where they can be successful. Have you set the right expectations, shown them what good looks like, provided feedback, created the right processes, and held them accountable? If you have, then the results will speak for themselves, you won't have to micromanage along the way.