You can see a student slowly begin to understand.
The confusion fades and they become more confident.
Connections and associations are made without prompting.
There is an inevitable humility.

The student starts to respect the art and gains some inkling of what the instructor is seeking to do.
They see these charlatans teachers with limited experience and no depth, and the student becomes contemptuous; finally recognising the lack, the shallowness evident in so many modern expressions of the art.