You must be true to yourself. Strong enough to be true to yourself. Brave enough to be strong enough to be true to yourself. Wise enough to be brave enough to be strong enough to shape yourself from what you actually are.
No other job in the world could possibly dispossess one so completely as this job of teaching. You could stand all day in a laundry, for instance, still in possession of your mind. But this teaching utterly obliterates you. It cuts right into your being: essentially, it takes over your spirit. It drags it out from where it would hide.