Two golden rules of teaching:"If you have not read a book, always make it clear to the students you have not done so; and (tangentially related) if you do not know the answer to a question, admit you do not know the answer. The desire of the teacher to appear omniscient must be resisted at all costs. Education is about teaching, not creating an image of genius where none really exists." (72)- Carl Trueman
HT: Michael Krahn