If the team do not believe in the leader they will not perform at their best which may mean not coming to him/her with problems, doing substandard work, being lazy or even undermining the leader. Whatever it is, it's counterproductive.
...means you let your people discover, manoeuvre, and improve through their efforts.
This is the case, certainly, although performance is required still, expected. In a military situation for instance, the learning needs to be done in training and that's why military units train so hard, why it can be so challenging. In combat things are learned, but it usually comes through the unit taking casualties, so it's best to learn ahead of time if possible.
Sorry for my late reply, I've had a busy day at work.
