It is unpleasant to hear it.

General instruction must indeed be given, but not general reproof.
(5.) Feel that in the management of the school _you_ are under obligation as well as the scholars, and let this feeling appear in all that you do.

Your scholars wish you to dismiss school earlier than usual on some particular occasion, or to allow them an extra holiday.

Show by the manner in which you consider and speak of the question that your main inquiry is what is _your duty_.

Speak often of your responsibility to your employers--not formally, but incidentally and naturally, as you will speak if you feel this responsibility.
It will assist very much, too, in securing cheerful, good-humored obedience to the regulations of the school, if you extend their authority over yourself.