Don't tell them
Here's something I underlined:
It's not enough to simply tell people what they need to do. That's not developing their potential. Instead, a leader must help them to do their jobs and do them well. Peter Drucker pointed out, "the largest single source of failed promotion is the failure to think through and help others to think through what a new job requires."
This quote is in the section, "People Development," which is the fourth level of leadership.