Working knowledge of themselves and getting past their own patterns, belief and limitations.
If a person can go through their deepest pain and handle most of their demons, they pop the puppet strings most people can never undo in their own lives. They learn to control matter, energy, space, and time.
These people who overcome these self-limiting thoughts, beliefs, issues, and programming become illuminated and empowered and guide other people, thereby becoming powerful.
Combined with that newfound working knowledgeable, they become leaders in their chosen professions- and life.