The answer is: The effective leader multiplies accomplishment through delegation
Effective leaders would have the awareness that they could never achieved success without the collective help of their team members.
Because of this, most of the time they need to learn to trust other people and delegate some of the power to them.
To do this, the leaders need to realize that they sometimes need to rely on the people that have different expertise and characteristics with them. (which is why the references on different type of people form different backgrounds exist in the quote)