A person has to have an aptitude for a given occupation in order to be successful but but the person must also have the skills and the knowledge. The aptitude may be innate but skill and the knowledge are not. Skill comes from practice and knowledge comes from study. Managers need to be able to manage the daily operations of their organization, or at least their part of the organization, and they must be able to understand and prepare for the future needs of the organization. Planning, organizing, directing, controlling, and delegating are parts of the process but they are not the only parts.
Education is the key.
The world is changing faster than many of us can comprehend. Today's manager is more than a planner, organizer, director, controller, or delegator. Today's manager is the vanguard for the future. Education is closest thing we have to a guarantee of long term future success. So, I think it is time that we rewrite the classical definition of management to include education.