"We all are something, but none of us are everything."
Blaise Pascal 17th century French Mathematician/Physicist
Self-worth is critical; without enough of it the individual's ability to contribute to what will ultimately be the accomplishments of the group, is limited.
But too much of it, which sometimes leads to the belief that one's contribution is more important than that coming from others, can be worse.
Do you attempt to manage self-worth among your direct reports?