Hi, everyone

As for Bruce, thanks for William A. Ward's quote:
The mediocre teacher tells.
The good teacher explains.
The superior teacher demonstrates.
The great teacher inspires.

As this is Ericksonian Therapy's forum, so let me add something for the sake of it.
Well, how about:
The useful teacher/therapist knows WHEN student/client is ready for a certain kind of teaching/therapy.

I don't know if it could be called mind reading? Though I read somewhere that Erickson didn't believe this kind of thing but the way he knew WHEN the patients were ready are really magic. Besides, he always stressed the need of clinical observation and the uniquesness of each individuals.

So knowing WHEN, HOW and to WHOM are the key of (to be) the useful teacher/therapist.

Hope it would help.