Sri Ramakrishna: "Like the physicians, there are three types of religious teachers. The inferior teacher only gives instruction to the disciples but makes no inquiries about their progress. The mediocre teacher, for the good of the student, makes repeated efforts to bring the instruction home to him, begs him to assimilate it, and shows him love in many other ways. But there is a type of teacher who goes to the length of using force when he finds the student persistently unyielding; I call him the best teacher."
Source: gospel of Sri Ramakrishna