" The greatest challenge a teacher has to accept is the courage to be; if we are, we make mistakes; we say too much where we should have said nothing; we do not speak where a word might have made all the difference. If we are, we will make terrible errors. But we still have to have the courage to struggle on, trusting in our own points of reference to show us the way. "

― Madeleine L'Engle , A Circle of Quiet (Crosswicks Journals #1)