Habitual slighting of commands on the part of pupils, even though there
is a valid reason for it, has a tendency to make positive willful
disobedience easier. The removal of all cause of misunderstanding is
therefore important from a disciplinary point of view, as well as for
the sake of the instruction itself. That such cause of misunderstanding
may be removed by the teacher who is sufficiently thorough and
painstaking in preparing the way for the understanding of a new lesson,
is indicated below.