Instructor?

A black belt does not mean that the student is an instructor or even has the remotest idea of how to organise material, teach, assess students and run a school.  

Most martial arts want their instructors to possess at least three black belts and over a decade of experience before they start teaching.

Black belt does not mean 'instructor'

Gaining a black belt does not mean that you are ready to teach. Not at all.
There are 10 dan belts to pass in our syllabus.

Being an instructor is altogether different to simply attending classes. Not every black belt student is capable of being an instructor.

Patience

It is common for students to train a martial art for a number of months or even a year or two and then quit.
Some may even last until black belt, only to leave then as though black belt was the end of their training.
A few years of practice really amounts to nothing.

An internal martial artist is thinking in terms of decades..
They train patiently every day.
Their expectations are realistic.
Neither lazy nor complacent, the student works through the many challenges and obstacles, becoming stronger, calmer and more adept.