If, however, every case of disobedience, or idleness, or disorder, is brought out publicly before the school, so that all witness the teacher's displeasure and feel the effects of it (for to witness it is to feel its most unpleasant effects), the school becomes, in a short time, hardened to such scenes.
Unpleasant associations become connected with the management of the school, and the scholars are prepared to do wrong with less reluctance, since the consequence is only a repetition of what they are obliged to see every day.
Besides, if a boy does something wrong, and you severely reprove him in the presence of his class, you punish the class almost as much as you do him.

In fact, in many cases you punish them more; for I believe it is almost invariably more unpleasant for a good boy to stand by and listen to rebukes, than for a bad boy to take them.

Keep these things, therefore, as much as possible out of sight.

Never bring forward cases of discipline except on mature deliberation, and for a distinct and well-defined purpose.
(3.) Never bring forward a case of discipline of this kind unless you are sure that public opinion will go in your favor.

If a case comes up in which the sympathy of the scholars is excited for the criminal in such a way as to be against yourself, the punishment will always do more harm than good.