An instructor should exemplify the things he seeks to teach. It will be of great advantage if you yourself can do all you ask of your students and more.
From form to formless and from finite to infinite
Things live by moving and gain strength as they go.
Efficiency is anything that scores.
Make at least one definite move daily toward your goal.
Put every great teacher in a room, and they'd agree about everything, but put their disciples in there and they'd argue about everything.