Proper delegation can multiply your effectiveness while allowing others to grow.
People in positions of responsibility sometimes feel they are the only ones who can perform necessary tasks when others are capable of handling part of the load.
Allow someone to prove their worthiness. If that requires you taking the time to train them in a specific area, then it’s well worth doing so to maximize performance.
Ramona Mills 
I have some Majors who could learn by your teaching :-).