There are people in your team, project, around you, who are recognized. They know a lot, they are doing a lot, they are always here whenever there is something to do, a problem to solve, need for help. Everyone knows how good, passionate and motivated they are. They are eager, they will do everything what they can to commit what they promised.
It’s good to have a such person in your team. Especially if the person is a team player with passion that can affect others. People will invest in themselves to reach such level, with the attitude such person will motivate them to grow.
However, there is also another side of the coin and as a leader you should remember about it.