So here's installment 1. It's from Steven Cahn's Saints and Scamps: Ethics in Academia (p. 9 in the 1986 edition, but the book's been released in a 25th anniversary edition):
A teacher is properly held responsible for what occurs in the classroom, and with responsibility must go authority. ...To recognize a teacher's authority, however, is not to suggest that a teacher should act in an authoritarian manner, exercising complete control over the will of her students. The appropriate relationship is that of guide, not god.